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AnthropicLLM matchup

Claude Opus 5.5vs.Claude Sonnet 5

Is the higher price worth it?

Claude Opus 5.5 performs better than Claude Sonnet 5, but costs twice as much.

Opus 5.5 ahead
IntelligenceOverall index, 100 points = average
126.1

Claude Opus 5.5

Rank 1

92.1

Claude Sonnet 5

Rank 40

about as fast
SpeedTokens per second
106

Claude Opus 5.5

103

Claude Sonnet 5

Sonnet 5 cheaper
Price$ per 1M tokens
$8

Claude Opus 5.5

$4

Claude Sonnet 5

about as popular
Popularity0 to 100
68

Claude Opus 5.5

Rank 8 of 785

64

Claude Sonnet 5

Rank 15 of 785

Choose Claude Opus 5.5 for

KnowledgeMathematicsGeneralCodingMultimodalReasoningHealthCybersecurityProductivityLegalAgentsFinance

Choose Claude Sonnet 5 for

No clear advantage

Where is the difference?

Strengths at a glance

Opus 5.5Sonnet 5Median of all ranked models

10012014080CodingOpus 5.5ReasoningOpus 5.5MathematicsOpus 5.5KnowledgeOpus 5.5AgentsOpus 5.5GeneralOpus 5.5MultimodalOpus 5.5FinanceOpus 5.5LegalOpus 5.5HealthOpus 5.5
CodingOpus 5.5 ahead
Opus 5.5129.9Rank 1
Sonnet 593.6Rank 44
Median of ranked models84.1

95 % range: Opus 5.5 121.2 to 138.7, Sonnet 5 89.6 to 97.6.

AreaOpus 5.5Sonnet 5

The same values and verdicts as the bars below. In the close-up the net starts at 80 points, just below the weaker model's lowest value; the reference group average is 100.

Opus 5.5 is ahead in 10 of 10 areas, Sonnet 5 in none.

Opus 5.5 ahead: 10

Areas in the overall index
KnowledgeOpus 5.5 +45131.4 to 86.0
MathematicsOpus 5.5 +39131.8 to 93.0
GeneralOpus 5.5 +37125.1 to 88.4
CodingOpus 5.5 +36129.9 to 93.6
MultimodalOpus 5.5 +33123.1 to 90.2
ReasoningOpus 5.5 +32122.5 to 90.3
AgentsOpus 5.5 +23117.2 to 94.6
Specialist fields
HealthOpus 5.5 +31122.1 to 90.6
LegalOpus 5.5 +26121.5 to 95.8
FinanceOpus 5.5 +21121.4 to 100.5

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Show 4 more areas that do not count toward the overall index
CybersecurityOpus 5.5 +28120.5 to 92.1
ProductivityOpus 5.5 +28125.0 to 97.0
Searchonly Opus 5.5 has a score
Educationonly Opus 5.5 has a score

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Claude Opus 5.5 vs. Claude Sonnet 5 at the same effort

Both models measured at the same reasoning efforts. This shows whether a lead comes from the model or only from more compute.

maxOpus 5.5 ahead
Opus 5.5 126.1 vs. Sonnet 5 92.1 · Gap 23.2 · Test series 3
Overall index (max vs. max)Opus 5.5 ahead
Opus 5.5 126.1 vs. Sonnet 5 92.1

Gap and verdict compare only the Artificial Analysis test series in which both models are measured at that effort. Tied below 3 points, ahead only beyond two standard errors. The single values rest on all test series of each model, so their difference can deviate from the gap.

Which model for which task?

Everyday tasks, translated from the area values above. Each row names the values it rests on.

Writing and debugging codeOpus 5.5Coding 129.9 to 93.6
Maths and data analysisOpus 5.5Mathematics 131.8 to 93.0, Reasoning 122.5 to 90.3
Facts and researchOpus 5.5Knowledge 131.4 to 86.0, Search without a score for Sonnet 5
Agents and workflowsOpus 5.5Agents 117.2 to 94.6
Fast chat repliesabout the same106 to 103 tokens per second
Security analysisOpus 5.5Cybersecurity 120.5 to 92.1
Many requests on a small budgetSonnet 5$8 to $4 per 1M tokens
Finance, legal and medical textsOpus 5.5Finance 121.4 to 100.5, Legal 121.5 to 95.8, Health 122.1 to 90.6
Images, screenshots and PDFsOpus 5.5Multimodal 123.1 to 90.2

See for yourself: same task, one attempt

The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.

Pelican on a bicycle

Prompt

Generate an SVG of a pelican riding a bicycle

Task origin: Simon Willison

Claude Opus 5.5

Claude Opus 5.5: Pelican on a bicycle
A community classic for free-form SVG drawing.

Oct 1, 2026 · 33 s · $0.07

Test details
Run date
Oct 1, 2026
API provider
openrouter
Requested API model
anthropic/claude-opus-5.5
Reasoning setting
high
Token limit including reasoning
8,192 tokens
Output tokens
3,536 tokens
Cost of the attempt
$0.0708
Response time
33.2 s
API model reported in response
anthropic/claude-opus-5.5
Pinned endpoint
Anthropic | anthropic/claude-opus-5.5-20260921
Temperature
Provider default
Test protocol
community-visual-tests-v1
Technical checks
Passed, not a quality rating

Visually reviewed. This individual test does not establish overall model quality.

Claude Sonnet 5

Claude Sonnet 5: Pelican on a bicycle
A community classic for free-form SVG drawing.

Sep 7, 2026 · 48 s · $0.03

Test details
Run date
Sep 7, 2026
API provider
openrouter
Requested API model
anthropic/claude-sonnet-5
Reasoning setting
high
Token limit including reasoning
8,192 tokens
Output tokens
3,394 tokens
Cost of the attempt
$0.0340
Response time
47.9 s
API model reported in response
anthropic/claude-sonnet-5
Pinned endpoint
Anthropic | anthropic/claude-sonnet-5-20260630
Temperature
Provider default
Test protocol
community-visual-tests-v1
Technical checks
Passed, not a quality rating

Visually reviewed. This individual test does not establish overall model quality.

SVG short test

SVG short test

One SVG task with the same fixed settings for every model, without hidden thinking.

Prompt

Return only one standalone SVG of a pelican riding a bicycle. Use viewBox="0 0 800 600", simple shapes, two clearly visible wheels and a recognizable pelican with a long beak. At most 30 SVG elements and 1800 characters. No Markdown, explanations, comments, scripts, animation, CSS or external resources.

Claude Opus 5.5

Unavailable in this round

Claude Sonnet 5

Unavailable in this round

Claude Opus 5.5 and Claude Sonnet 5 in the overall index

Every model with a place in the overall index, both models of this matchup highlighted. You can add or hide other models.

Overall index (Gradually Meta-Score v4)

20 of 92 models

4 models in this view are measured at a lower reasoning effort than max in the overall index. Dashed column: lower reasoning effort than the top.

Claude Opus 5.5max126.1
Gemini 4 Carbonhigh125.8
Claude Fable 5.1max123.8
Claude Sonnet 5.5max122.8
Gemini 4 Argonhigh122.3
GPT-6 Astramax121.3
GPT-6.1 Solmax119.2
Muse Wonder Fullmax118.3
Claude Opus 5max117.2
Muse Wondermax113.4
Kimi K3.1 Promax112.9
Claude Fable 5max112.5
GPT-6 Solmax110.5
GPT-5.6 Solmax108.7
Muse Spark 1.3max107.4
Gemini 3.7 Flashhigh107.1
DeepSeek V4.1 Flash 1017max106.6
Gemini 3.8 Flashhigh106.5
GPT-6.1 Terramax105.3
Claude Sonnet 5max92.1

Popularity compared

How often the models are searched for, used and mentioned, on a scale from 0 to 100.

Both are about as popular: Claude Opus 5.5 68, Claude Sonnet 5 64 out of 100.

Over time

Weekly values from October 18, 2026 to November 7, 2026

Claude Opus 5.5Claude Sonnet 5

All data side by side

The better value is bold. For the overall index only when the gap is clear.

MetricClaude Opus 5.5Claude Sonnet 5
Intelligence
Overall indexpoints, 100 = reference group average, higher is better126.192.1
RankRank 1 of 92Rank 40 of 92
Price per 1M tokens
Inputwhat you send$4$2
Outputwhat the model writes$20$10
Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included)$0.11$0.057
Speed
Tokens per second106103
Popularity
Popularitysearch, usage and mentions, 0 to 10068Rank 8 of 78564Rank 15 of 785
Technical
Context windowhow much text the model reads at once1 M tokens≈ 1,500 A4 pages1 M tokens≈ 1,500 A4 pages
Knowledge cutoffJune 2026January 2026
ReleasedSep 22, 2026Jun 30, 2026
AvailabilityActiveActive
Open weightsnono

Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis

Is there a better choice?

Successor of Sonnet 5Claude Sonnet 5.5

Overall index 122.8, rank 4$2 input and $10 output per 1M tokens

Opus 5.5 vs. Claude Sonnet 5.5
As cheap as Sonnet 5Gemini 4 Argon

Overall index 122.3, rank 5$2 input and $10 output per 1M tokens

Opus 5.5 vs. Gemini 4 Argon

Shared benchmarks

Single results from the same benchmark version, task and metric. A value is bold only with the same test setup and a clear gap.

A: Claude Opus 5.5B: Claude Sonnet 5

Code MigrationOverall · higher is betterClaude Opus 5.5: 66.6%Claude Sonnet 5: 44.4%Vals AIAs of 10/29/2026
CyberBench v1.1Overall · higher is betterClaude Opus 5.5: 55.4%Claude Sonnet 5: 61.9%Vals AIAs of 11/05/2026
EMBOverall · higher is betterClaude Opus 5.5: 75.9%Claude Sonnet 5: 66.3%Vals AIAs of 10/20/2026
Finance Agent (v2)Overall · higher is betterClaude Opus 5.5: 58.6%Claude Sonnet 5: 53.9%Vals AIAs of 10/29/2026
IOIOverall · higher is betterClaude Opus 5.5: 95.1%Claude Sonnet 5: 45.0%Vals AIAs of 10/29/2026
Legal Research BenchOverall · All-pass · higher is betterClaude Opus 5.5: 50.5%Claude Sonnet 5: 41.8%Vals AIAs of 11/05/2026
LMArena Code Arena WebDevOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 1,810Claude Sonnet 5: 1,540LMArenaAs of 10/28/2026
LMArena Text, Style ControlOverall · higher is betterClaude Opus 5.5: 1,509Claude Sonnet 5: 1,462LMArenaAs of 10/28/2026
LMArena Vision, Style ControlOverall · higher is betterClaude Opus 5.5: 1,293Claude Sonnet 5: 1,262LMArenaAs of 10/19/2026
MedCodeOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 49.8%Claude Sonnet 5: 47.5%Vals AIAs of 10/29/2026
Show 54 more benchmarks
MedScribeOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 91.4%Claude Sonnet 5: 76.1%Vals AIAs of 10/29/2026
ProgramBenchOverall · higher is betterClaude Opus 5.5: 18.5%Claude Sonnet 5: 0.0%Vals AIAs of 11/05/2026
ProofBench v1.1Overall · higher is betterClaude Opus 5.5: 100%Claude Sonnet 5: 77%Vals AIAs of 10/29/2026
Public Benefits Bench v1.1Overall · higher is betterClaude Opus 5.5: 70.6%Claude Sonnet 5: 66.0%Vals AIAs of 10/12/2026
SRE BenchOverall · higher is betterClaude Opus 5.5: 33.6%Claude Sonnet 5: 0.4%Vals AIAs of 11/05/2026
Tax Agent BenchOverall · higher is betterClaude Opus 5.5: 45.6%Claude Sonnet 5: 29.4%Vals AIAs of 11/05/2026
Terminal-Bench 4.0Overall · higher is betterClaude Opus 5.5: 65.2%Claude Sonnet 5: 10.6%Vals AIAs of 11/05/2026
Terminal-Bench 4.0Overall · higher is betterClaude Opus 5.5: 64.9%Claude Sonnet 5: 12.4%Terminal-BenchAs of 10/06/2026
Terminal-Bench-ScienceOverall · higher is betterClaude Opus 5.5: 47.1%Claude Sonnet 5: 5.7%Vals AIAs of 11/05/2026
Vibe Code Bench 1-100Overall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 30.4%Claude Sonnet 5: 13.8%Vals AIAs of 10/29/2026
Vibe Code Bench v1.1Overall · higher is betterClaude Opus 5.5: 90.3%Claude Sonnet 5: 81.3%Vals AIAs of 11/05/2026
Code MigrationCLI · higher is betterClaude Opus 5.5: 65.5%Claude Sonnet 5: 36.3%Vals AIAs of 10/29/2026
CyberBench v1.1Patch · higher is betterClaude Opus 5.5: 85.7%Claude Sonnet 5: 82.1%Vals AIAs of 11/05/2026
EMBComps · higher is betterClaude Opus 5.5: 76.4%Claude Sonnet 5: 69.4%Vals AIAs of 10/20/2026
Finance Agent (v2)Adjustments · higher is betterClaude Opus 5.5: 54.5%Claude Sonnet 5: 48.7%Vals AIAs of 10/29/2026
IOIIOI 2024 · higher is betterClaude Opus 5.5: 100.0%Claude Sonnet 5: 50.5%Vals AIAs of 10/29/2026
Legal Research BenchAdministrative / Regulatory · All-pass · higher is betterClaude Opus 5.5: 65.2%Claude Sonnet 5: 54.5%Vals AIAs of 11/05/2026
LMArena Code Arena WebDevHTML development · higher is betterTest setup not documented as identicalClaude Opus 5.5: 1,753Claude Sonnet 5: 1,527LMArenaAs of 10/28/2026
LMArena Text, Style ControlBusiness, management and finance · higher is betterClaude Opus 5.5: 1,495Claude Sonnet 5: 1,466LMArenaAs of 10/28/2026
LMArena Vision, Style ControlCreative writing with images · higher is betterClaude Opus 5.5: 1,287Claude Sonnet 5: 1,235LMArenaAs of 10/19/2026
ProgramBenchAlmost Resolved · higher is betterClaude Opus 5.5: 65.0%Claude Sonnet 5: 13.5%Vals AIAs of 11/05/2026
SRE BenchCapability Score · higher is betterClaude Opus 5.5: 53.6%Claude Sonnet 5: 7.7%Vals AIAs of 11/05/2026
Tax Agent BenchControversy & Precedence Analysis · higher is betterClaude Opus 5.5: 30%Claude Sonnet 5: 10%Vals AIAs of 11/05/2026
Terminal-Bench 4.0Hardware · higher is betterClaude Opus 5.5: 60%Claude Sonnet 5: 0%Vals AIAs of 11/05/2026
Terminal-Bench-ScienceEarth Sciences · higher is betterClaude Opus 5.5: 37.5%Claude Sonnet 5: 0.0%Vals AIAs of 11/05/2026
Code MigrationCOBOL · higher is betterClaude Opus 5.5: 70.0%Claude Sonnet 5: 68.6%Vals AIAs of 10/29/2026
CyberBench v1.1PoC · higher is betterClaude Opus 5.5: 25.0%Claude Sonnet 5: 41.7%Vals AIAs of 11/05/2026
EMBDataroom · higher is betterClaude Opus 5.5: 84.9%Claude Sonnet 5: 84.9%Vals AIAs of 10/20/2026
Finance Agent (v2)All-Pass · higher is betterClaude Opus 5.5: 48.1%Claude Sonnet 5: 42.1%Vals AIAs of 10/29/2026
IOIIOI 2025 · higher is betterClaude Opus 5.5: 100%Claude Sonnet 5: 42%Vals AIAs of 10/29/2026
Legal Research BenchAdministrative / Regulatory · Weighted partial credit (weighted pass) · higher is betterClaude Opus 5.5: 85.4%Claude Sonnet 5: 87.8%Vals AIAs of 11/05/2026
LMArena Code Arena WebDevImage to WebDev · higher is betterTest setup not documented as identicalClaude Opus 5.5: 1,753Claude Sonnet 5: 1,540LMArenaAs of 10/19/2026
LMArena Text, Style ControlChinese · higher is betterClaude Opus 5.5: 1,574Claude Sonnet 5: 1,498LMArenaAs of 10/28/2026
LMArena Vision, Style ControlDiagram understanding · higher is betterClaude Opus 5.5: 1,330Claude Sonnet 5: 1,293LMArenaAs of 10/19/2026
ProgramBenchFully Resolved · higher is betterClaude Opus 5.5: 18.5%Claude Sonnet 5: 0.0%Vals AIAs of 11/05/2026
SRE BenchFully Solved · higher is betterClaude Opus 5.5: 33.6%Claude Sonnet 5: 0.4%Vals AIAs of 11/05/2026
Tax Agent BenchControversy & Precedence Analysis (weighted pass) · higher is betterClaude Opus 5.5: 66.9%Claude Sonnet 5: 57.4%Vals AIAs of 11/05/2026
Terminal-Bench 4.0Media · higher is betterClaude Opus 5.5: 75.0%Claude Sonnet 5: 8.3%Vals AIAs of 11/05/2026
Terminal-Bench-ScienceEngineering Sciences · higher is betterClaude Opus 5.5: 22.2%Claude Sonnet 5: 0.0%Vals AIAs of 11/05/2026
Code MigrationCode Quality · higher is betterClaude Opus 5.5: 4.541 / 5Claude Sonnet 5: 4.898 / 5Vals AIAs of 10/29/2026
EMBDCF · higher is betterClaude Opus 5.5: 70.1%Claude Sonnet 5: 56.4%Vals AIAs of 10/20/2026
Finance Agent (v2)Comparables · higher is betterClaude Opus 5.5: 45.8%Claude Sonnet 5: 45.8%Vals AIAs of 10/29/2026
IOIIOI 2026 · higher is betterClaude Opus 5.5: 85.2%Claude Sonnet 5: 42.5%Vals AIAs of 10/29/2026
Legal Research BenchBusiness & Commercial · All-pass · higher is betterClaude Opus 5.5: 48.8%Claude Sonnet 5: 32.6%Vals AIAs of 11/05/2026
LMArena Code Arena WebDevReact development · higher is betterTest setup not documented as identicalClaude Opus 5.5: 1,860Claude Sonnet 5: 1,540LMArenaAs of 10/28/2026
LMArena Text, Style ControlCoding · higher is betterClaude Opus 5.5: 1,551Claude Sonnet 5: 1,520LMArenaAs of 10/28/2026
LMArena Vision, Style ControlEnglish · higher is betterClaude Opus 5.5: 1,284Claude Sonnet 5: 1,263LMArenaAs of 10/19/2026
ProgramBenchRaw Pass Rate · higher is betterClaude Opus 5.5: 87.0%Claude Sonnet 5: 72.1%Vals AIAs of 11/05/2026
Tax Agent BenchCurrent & Temporal Analysis · higher is betterClaude Opus 5.5: 46.6%Claude Sonnet 5: 30.0%Vals AIAs of 11/05/2026
Terminal-Bench 4.0ML · higher is betterClaude Opus 5.5: 81.8%Claude Sonnet 5: 18.2%Vals AIAs of 11/05/2026
Terminal-Bench-ScienceLife Sciences · higher is betterClaude Opus 5.5: 52.6%Claude Sonnet 5: 10.5%Vals AIAs of 11/05/2026
EMBLBO · higher is betterClaude Opus 5.5: 69%Claude Sonnet 5: 60%Vals AIAs of 10/20/2026
Finance Agent (v2)Disclosure Analysis · higher is betterClaude Opus 5.5: 71.0%Claude Sonnet 5: 62.1%Vals AIAs of 10/29/2026
Legal Research BenchBusiness & Commercial · Weighted partial credit (weighted pass) · higher is betterClaude Opus 5.5: 71.0%Claude Sonnet 5: 86.8%Vals AIAs of 11/05/2026

More comparisons

Compare Claude Opus 5.5 and Claude Sonnet 5 with the models people compare them with most often.

Compare another matchup

The most popular comparisons

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  3. 3Claude Opus 5.5 vs. DeepSeek-V4-Pro
  4. 4Claude Opus 5.5 vs. Kimi K3.1 Pro
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  4. 13Claude Opus 5.5 vs. Claude Haiku 5.5
  5. 14Claude Opus 5.5 vs. GLM-5.3
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  7. 16Claude Opus 5.5 vs. Gemini 3.1 Pro Preview
  8. 17Claude Opus 5.5 vs. Claude Opus 4.6
  9. 18Claude Sonnet 5 vs. DeepSeek-V4.1-Flash
  10. 19Claude Opus 5.5 vs. Claude Sonnet 4.6
  11. 20Claude Opus 5.5 vs. Qwen 3.8 27B
  12. 21Claude Opus 5.5 vs. Grok 4.6
  13. 22Claude Sonnet 5 vs. GPT-6 Luna
  14. 23Claude Opus 5.5 vs. GLM-5.2
  15. 24Claude Opus 5.5 vs. Gemini 4 Carbon
  16. 25Claude Opus 5.5 vs. DeepSeek V4.1 Flash 1017
  17. 26Claude Opus 5.5 vs. Claude Sonnet 4.5
  18. 27Claude Opus 5.5 vs. Muse Spark 1.3
  19. 28Claude Opus 5.5 vs. Claude Opus 4.8
  20. 29Claude Opus 5.5 vs. GPT-5.6 Luna
  21. 30Claude Opus 5.5 vs. Mistral Large 4
  22. 31Claude Opus 5.5 vs. GPT-5.6 Sol
  23. 32Claude Opus 5.5 vs. GPT-5.5
  24. 33Claude Opus 5.5 vs. DeepSeek-V4-Flash
  25. 34Claude Opus 5.5 vs. Grok 4.7
  26. 35Claude Opus 5.5 vs. Mistral Large 3
  27. 36Claude Opus 5.5 vs. GPT-6 Luna
  28. 37Claude Sonnet 5 vs. GPT-6.1 Sol
  29. 38Claude Opus 5.5 vs. Claude Opus 4.5
  30. 39Claude Sonnet 5 vs. DeepSeek V4.1 Flash 1017
  31. 40Claude Haiku 5.5 vs. Claude Sonnet 5
  32. 41Claude Opus 5.5 vs. Claude Fable 5
  33. 42Claude Sonnet 5 vs. GPT-6 Astra
  34. 43Claude Opus 5.5 vs. GPT-6 Sol
  35. 44Claude Sonnet 5 vs. GPT-6 Sol
  36. 45Claude Opus 5.5 vs. Gemini 3.6 Flash
  37. 46Claude Opus 5.5 vs. Mistral Medium 3.5
  38. 47Claude Opus 5.5 vs. Muse Wonder Full
  39. 48Claude Opus 5.5 vs. Claude Haiku 4.5
  40. 49Claude Sonnet 5 vs. Qwen 3.8 Max 0902
  41. 50Claude Opus 5 vs. Claude Sonnet 5
  42. 51Claude Sonnet 5 vs. Mistral Large 4
  43. 52Claude Opus 5.5 vs. Gemini 3.5 Flash
  44. 53Claude Opus 5.5 vs. GPT-6.1 Terra
  45. 54Claude Sonnet 5 vs. Claude Haiku 4.5
  46. 55Claude Opus 5.5 vs. GPT-5.4
  47. 56Claude Opus 5.5 vs. GLM-5.1
  48. 57Claude Sonnet 5 vs. GPT-5.6 Luna
  49. 58Claude Sonnet 5 vs. Gemini 4 Argon
  50. 59Claude Sonnet 5 vs. GPT-6.1 Terra
  51. 60Claude Sonnet 5 vs. Kimi K3.1 Pro