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- Claude Opus 5.5 vs. Claude Opus 5
AnthropicLLM matchup
Claude Opus 5.5vs.Claude Opus 5
What has improved?
Claude Opus 5.5 performs better than Claude Opus 5 and is cheaper: Claude Opus 5 costs 1.3 times as much.
Claude Opus 5.5
Rank 1
Claude Opus 5
Rank 9
Claude Opus 5.5
Claude Opus 5
Claude Opus 5.5
Claude Opus 5
Claude Opus 5.5
Rank 9 of 785
Claude Opus 5
Rank 23 of 785
Choose Claude Opus 5.5 for
Choose Claude Opus 5 for
On this page
Where is the difference?
Strengths at a glance
Opus 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: Opus 5.5 121.2 to 138.7, Opus 5 114.4 to 121.6.
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.
Opus 5.5 is ahead in 6 of 10 areas, Opus 5 in none.
Opus 5.5 ahead: 6Opus 5.5 slightly ahead: 3Opus 5 slightly 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 Opus 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.
| Effort | Opus 5.5 | Opus 5 | Gap | Verdict | Test series |
|---|---|---|---|---|---|
| max | 126.1 | 117.2 | 11.8 | Opus 5.5 ahead | 12 |
| Overall index (max vs. max) | 126.1 | 117.2 | 8.9 | Opus 5.5 ahead |
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.
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.
Claude Opus 5.5

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 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 Opus 5.5
Unavailable in this round
Claude Opus 5
Unavailable in this round
Claude Opus 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 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.
Popularity compared
How often the models are searched for, used and mentioned, on a scale from 0 to 100.
Claude Opus 5.5 is more popular than Claude Opus 5: 68 to 63 out of 100.
Over time
Weekly values from October 18, 2026 to November 8, 2026
Claude Opus 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 Opus 5.5 | Claude Opus 5 |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 126.1 | 117.2 |
| Rank | Rank 1 of 92 | Rank 9 of 92 |
| Price per 1M tokens | ||
| Inputwhat you send | $4 | $5 |
| Outputwhat the model writes | $20 | $25 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.11 | $0.14 |
| Speed | ||
| Tokens per second | 106 | 66 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 68Rank 9 of 785 | 63Rank 23 of 785 |
| 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 22, 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 122.8, rank 4$2 input and $10 output per 1M tokens
Opus 5.5 vs. Claude Sonnet 5.5Shared 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 Opus 5
Show 54 more benchmarks
More comparisons
Compare Claude Opus 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 Opus 5.5 vs. GPT-6 Astra
- 2Claude Opus 5.5 vs. Claude Sonnet 5.5
- 3Claude Opus 5.5 vs. DeepSeek-V4-Pro
- 4Claude Opus 5.5 vs. Kimi K3.1 Pro
- 5Claude Opus 5.5 vs. Gemini 4 Argon
- 6Claude Opus 5.5 vs. Gemini 3.8 Flash
- 7Claude Opus 5.5 vs. Claude Fable 5.1
- 8Claude Opus 5.5 vs. DeepSeek-V4.1-Flash
- 9Claude Opus 5.5 vs. Qwen 3.8 Max 0902
Show all 72 comparisons
- 10Claude Opus 5.5 vs. GLM-5.3-Flash
- 11Claude Opus 5.5 vs. GPT-6.1 Sol
- 12Claude Opus 5.5 vs. Kimi K3
- 13Claude Opus 5.5 vs. Claude Sonnet 5
- 14Claude Opus 5.5 vs. Claude Haiku 5.5
- 15Claude Opus 5.5 vs. GLM-5.3
- 16Claude Sonnet 5.5 vs. Claude Opus 5
- 17Claude Opus 5.5 vs. GPT-5.6 Terra
- 18Claude Opus 5.5 vs. Gemini 3.1 Pro Preview
- 19Claude Opus 5.5 vs. Claude Opus 4.6
- 20Claude Opus 5.5 vs. Claude Sonnet 4.6
- 21Claude Opus 5.5 vs. Qwen 3.8 27B
- 22Claude Opus 5.5 vs. Grok 4.6
- 23Claude Opus 5.5 vs. GLM-5.2
- 24Claude Opus 5.5 vs. Gemini 4 Carbon
- 25Claude Opus 5 vs. DeepSeek-V4.1-Flash
- 26Claude Opus 5.5 vs. DeepSeek V4.1 Flash 1017
- 27Claude Opus 5.5 vs. Claude Sonnet 4.5
- 28Claude Opus 5.5 vs. Muse Spark 1.3
- 29Claude Opus 5.5 vs. Claude Opus 4.8
- 30Claude Opus 5.5 vs. GPT-5.6 Luna
- 31Claude Opus 5 vs. Gemini 3.8 Flash
- 32Claude Opus 5 vs. GLM-5.3-Flash
- 33Claude Opus 5 vs. DeepSeek-V4-Pro
- 34Claude Opus 5 vs. GPT-6 Astra
- 35Claude Opus 5.5 vs. Mistral Large 4
- 36Claude Opus 5.5 vs. GPT-5.6 Sol
- 37Claude Opus 5.5 vs. GPT-5.5
- 38Claude Opus 5 vs. Kimi K3
- 39Claude Opus 5.5 vs. DeepSeek-V4-Flash
- 40Claude Opus 5.5 vs. Grok 4.7
- 41Claude Opus 5 vs. Mistral Large 4
- 42Claude Opus 5 vs. GPT-6.1 Sol
- 43Claude Opus 5 vs. Muse Spark 1.3
- 44Claude Opus 5.5 vs. Mistral Large 3
- 45Claude Opus 5.5 vs. GPT-6 Luna
- 46Claude Opus 5.5 vs. Claude Opus 4.5
- 47Claude Opus 5 vs. Grok 4.6
- 48Claude Opus 5 vs. Qwen 3.8 27B
- 49Claude Haiku 5.5 vs. Claude Opus 5
- 50Claude Opus 5.5 vs. Claude Fable 5
- 51Claude Opus 5 vs. GLM-5.3
- 52Claude Opus 5.5 vs. GPT-6 Sol
- 53Claude Opus 5 vs. GPT-5.6 Terra
- 54Claude Opus 5 vs. DeepSeek V4.1 Flash 1017
- 55Claude Opus 5.5 vs. Gemini 3.6 Flash
- 56Claude Opus 5.5 vs. Mistral Medium 3.5
- 57Claude Opus 5.5 vs. Muse Wonder Full
- 58Claude Opus 5 vs. GPT-6 Sol
- 59Claude Opus 5 vs. Grok 4.7
- 60Claude Opus 5.5 vs. Claude Haiku 4.5
- 61Claude Opus 5 vs. Claude Sonnet 5
- 62Claude Opus 5 vs. GPT-5.6 Luna
- 63Claude Opus 5 vs. Claude Sonnet 4.5
- 64Claude Opus 5.5 vs. GPT-6.1 Terra
- 65Claude Opus 5.5 vs. Gemini 3.5 Flash
- 66Claude Opus 5.5 vs. GPT-5.4
- 67Claude Opus 5.5 vs. GLM-5.1
- 68Claude Opus 5 vs. Gemini 4 Carbon
- 69Claude Opus 5 vs. Gemini 4 Argon
- 70Claude Opus 5 vs. Kimi K3.1 Pro
- 71Claude Opus 5 vs. Muse Wonder Full
- 72Claude Opus 5 vs. GPT-6.1 Terra