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AnthropicLLM matchup
Claude Sonnet 5.5vs.Claude Opus 5
Is the higher price worth it?
Claude Sonnet 5.5 and Claude Opus 5 perform about equally well, but Claude Opus 5 costs 2.5 times as much.
Claude Sonnet 5.5
Rank 5
Claude Opus 5
Rank 10
Claude Sonnet 5.5
Claude Opus 5
Claude Sonnet 5.5
Claude Opus 5
Claude Sonnet 5.5
Rank 21 of 478
Claude Opus 5
Rank 18 of 478
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Where is the difference?
Strengths at a glance
Sonnet 5.5Opus 5
The median of all ranked models is below 100 in every area, so it sits in the centre of the net.
95 % range: Sonnet 5.5 119.5 to 130.9, Opus 5 114.5 to 122.1.
The same values and verdicts as the bars below. In the close-up the net starts at 100 points, just below the weaker model's lowest value; the reference group average is 100. Not in the net because a model has no own value there or the data are too thin: Knowledge.
Sonnet 5.5 is ahead in 5 of 10 areas, Opus 5 in 1.
Sonnet 5.5 ahead: 5level: 2too little data: 1Opus 5 slightly ahead: 1Opus 5 ahead: 1
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
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 Sonnet 5.5 vs. Claude Opus 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.
The gap compares 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.
Which model for which task?
Everyday tasks, translated from the area values above. Each row names the values it rests on.
Claude Sonnet 5.5 vs. Claude Opus 5 in our own test
The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.
Claude Sonnet 5.5

Oct 1, 2026 · 28 s · $0.04
Test details
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- anthropic/claude-sonnet-5.5
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,886 tokens
- Cost of the attempt
- $0.0389
- Response time
- 28.2 s
- API model reported in response
- anthropic/claude-sonnet-5.5
- Pinned endpoint
- Anthropic | anthropic/claude-sonnet-5.5-20260928
- 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 Opus 5

Oct 1, 2026 · 63 s · $0.14
Test details
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- anthropic/claude-opus-5
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 5,423 tokens
- Cost of the attempt
- $0.1357
- Response time
- 63 s
- API model reported in response
- anthropic/claude-opus-5
- Pinned endpoint
- Anthropic | anthropic/claude-opus-5-20260723
- 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.
Earlier attempts (1)
- Sep 7, 2026API request failedReasoning setting: high
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 Sonnet 5.5
Unavailable in this round
Claude Opus 5
Unavailable in this round
Claude Sonnet 5.5 and Claude Opus 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 v5)
20 of 95 models
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 Sonnet 5.5 79, Claude Opus 5 81 out of 100.
Over time
Weekly values from October 18, 2026 to November 13, 2026
Claude Sonnet 5.5Claude Opus 5
All data side by side
The better value is bold. For the overall index only when the gap is clear.
| Metric | Claude Sonnet 5.5 | Claude Opus 5 |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 121.9 | 117.3 |
| Rank | Rank 5 of 95 | Rank 10 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $2 | $5 |
| Outputwhat the model writes | $10 | $25 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.038 | $0.14 |
| Speed | ||
| Tokens per second | 103 | 71 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 79Rank 21 of 478 | 81Rank 18 of 478 |
| Technical | ||
| Context windowhow much text the model reads at once | 1 M tokens≈ 1,500 A4 pages | 1 M tokens≈ 1,500 A4 pages |
| Knowledge cutoff | June 2026 | May 2026 |
| Released | Sep 28, 2026 | Jul 24, 2026 |
| Availability | Active | Active |
| Open weights | no | no |
Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis
Is there a better choice?
Overall index 125.7, rank 3$4 input and $20 output per 1M tokens
Sonnet 5.5 vs. Claude Opus 5.5Overall index 127.0, rank 2$2 input and $10 output per 1M tokens
Sonnet 5.5 vs. Gemini 4 CarbonOverall index 130.9, rank 1$8 input and $40 output per 1M tokens
Sonnet 5.5 vs. Claude Fable 5.2Shared 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 Sonnet 5.5B: Claude Opus 5
Show 54 more benchmarks
More comparisons
Compare Claude Sonnet 5.5 and Claude Opus 5 with the models people compare them with most often.
Compare another matchup
Predecessor and successor
The most popular comparisons
- 1Claude Sonnet 5.5 vs. Gemini 3.8 Flash
- 2Claude Sonnet 5.5 vs. DeepSeek-V4.1-Flash
- 3Claude Opus 5.5 vs. Claude Sonnet 5.5
- 4Claude Sonnet 5.5 vs. GLM-5.3
- 5Claude Sonnet 5.5 vs. Claude Haiku 5.5
- 6Claude Sonnet 5.5 vs. Grok 4.7
- 7Claude Sonnet 5.5 vs. GPT-5.6 Terra
- 8Claude Opus 5 vs. DeepSeek-V4.1-Flash
- 9Claude Sonnet 5.5 vs. Claude Fable 5.1
Show all 73 comparisons
- 10Claude Opus 5 vs. GLM-5.3-Flash
- 11Claude Sonnet 5.5 vs. Gemini 3.1 Pro Preview
- 12Claude Sonnet 5.5 vs. DeepSeek V4.1 Flash 1017
- 13Claude Opus 5 vs. Gemini 3.8 Flash
- 14Claude Sonnet 5.5 vs. GPT-6 Luna
- 15Claude Sonnet 5.5 vs. Kimi K3
- 16Claude Sonnet 5.5 vs. Qwen 3.8 27B
- 17Claude Sonnet 5.5 vs. Claude Opus 4.6
- 18Claude Sonnet 5.5 vs. DeepSeek-V4-Pro
- 19Claude Sonnet 5.5 vs. GPT-5.6 Luna
- 20Claude Opus 5 vs. DeepSeek-V4-Pro
- 21Claude Sonnet 5.5 vs. GLM-5.2
- 22Claude Sonnet 5.5 vs. DeepSeek-V4-Flash
- 23Claude Opus 5 vs. Kimi K3
- 24Claude Opus 5 vs. GPT-6 Astra
- 25Claude Sonnet 5.5 vs. GPT-6 Sol
- 26Claude Sonnet 5.5 vs. Gemini 3.5 Flash-Lite
- 27Claude Sonnet 5.5 vs. Claude Fable 5
- 28Claude Sonnet 5.5 vs. Qwen 3.8 Max 0902
- 29Claude Sonnet 5.5 vs. Gemini 3.6 Flash
- 30Claude Sonnet 5.5 vs. Claude Sonnet 4.6
- 31Claude Sonnet 5.5 vs. GPT-5.6 Sol
- 32Claude Opus 5 vs. Qwen 3.8 27B
- 33Claude Opus 5 vs. GLM-5.3
- 34Claude Sonnet 5.5 vs. GLM-5.3-Flash
- 35Claude Opus 5 vs. GPT-5.6 Terra
- 36Claude Opus 5 vs. GPT-5.6 Luna
- 37Claude Sonnet 5.5 vs. Muse Spark 1.3
- 38Claude Opus 5 vs. Grok 4.6
- 39Claude Sonnet 5.5 vs. Claude Opus 4.7
- 40Claude Haiku 5.5 vs. Claude Opus 5
- 41Claude Opus 5 vs. Mistral Large 4
- 42Claude Opus 5 vs. Grok 4.7
- 43Claude Opus 5 vs. DeepSeek V4.1 Flash 1017
- 44Claude Sonnet 5.5 vs. GPT-6 Astra
- 45Claude Sonnet 5.5 vs. Claude Opus 4.8
- 46Claude Opus 5 vs. Muse Spark 1.3
- 47Claude Opus 5 vs. Claude Sonnet 5
- 48Claude Opus 5 vs. GPT-6 Sol
- 49Claude Sonnet 5.5 vs. Kimi K2.6
- 50Claude Opus 5 vs. Qwen 3.8 Max 0902
- 51Claude Sonnet 5.5 vs. Grok 4.6
- 52Claude Opus 5 vs. Claude Sonnet 4.5
- 53Claude Sonnet 5.5 vs. GPT-6.1 Sol
- 54Claude Sonnet 5.5 vs. Claude Sonnet 4.5
- 55Claude Sonnet 5.5 vs. Gemini 3.7 Flash
- 56Claude Sonnet 5.5 vs. Claude Haiku 4.5
- 57Claude Sonnet 5.5 vs. Mistral Large 4
- 58Claude Sonnet 5.5 vs. Mistral Medium 3.5
- 59Claude Sonnet 5.5 vs. GPT-5.4
- 60Claude Sonnet 5.5 vs. Gemini 3.5 Flash
- 61Claude Sonnet 5.5 vs. GPT-5.5
- 62Claude Sonnet 5.5 vs. Claude Opus 4.5
- 63Claude Sonnet 5.5 vs. Kimi K3.1 Pro
- 64Claude Opus 5 vs. Gemini 4 Carbon
- 65Claude Sonnet 5.5 vs. GPT-6.1 Terra
- 66Claude Opus 5 vs. GPT-6.1 Sol
- 67Claude Sonnet 5.5 vs. Muse Wonder Full
- 68Claude Opus 5 vs. Gemini 4 Argon
- 69Claude Sonnet 5.5 vs. Gemini 4 Argon
- 70Claude Sonnet 5.5 vs. Gemini 4 Carbon
- 71Claude Opus 5 vs. Kimi K3.1 Pro
- 72Claude Opus 5 vs. Muse Wonder Full
- 73Claude Opus 5 vs. GPT-6.1 Terra