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- Claude Sonnet 5.5 vs. Claude Sonnet 5
AnthropicLLM matchup
Claude Sonnet 5.5vs.Claude Sonnet 5
What has improved?
Claude Sonnet 5.5 performs better than Claude Sonnet 5 at the same price.
Claude Sonnet 5.5
Rank 5
Claude Sonnet 5
Rank 45
Claude Sonnet 5.5
Claude Sonnet 5
Claude Sonnet 5.5
Claude Sonnet 5
Claude Sonnet 5.5
Rank 21 of 478
Claude Sonnet 5
Rank 20 of 478
Choose Claude Sonnet 5.5 for
No clear advantage for Claude Sonnet 5.
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Where is the difference?
Strengths at a glance
Sonnet 5.5Sonnet 5Median of all ranked models
95 % range: Sonnet 5.5 119.5 to 130.9, Sonnet 5 89.6 to 98.5.
The same values and verdicts as the bars below. In the close-up the net starts at 75 points, just below the weaker model's lowest value; the reference group average is 100.
Sonnet 5.5 is ahead in 10 of 10 areas, Sonnet 5 in none.
Sonnet 5.5 ahead: 10
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 3 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.
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 Sonnet 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 Sonnet 5

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 Sonnet 5.5
Unavailable in this round
Claude Sonnet 5
Unavailable in this round
Claude Sonnet 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 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 Sonnet 5 80 out of 100.
Over time
Weekly values from October 18, 2026 to November 13, 2026
Claude Sonnet 5.5Claude Sonnet 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 Sonnet 5 |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 121.9 | 92.0 |
| Rank | Rank 5 of 95 | Rank 45 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $2 | $2 |
| Outputwhat the model writes | $10 | $10 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.038 | $0.057 |
| Speed | ||
| Tokens per second | 103 | 77 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 79Rank 21 of 478 | 80Rank 20 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 | January 2026 |
| Released | Sep 28, 2026 | Jun 30, 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 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 Sonnet 5
Show 54 more benchmarks
More comparisons
Compare Claude Sonnet 5.5 and Claude Sonnet 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 Opus 5.5 vs. Claude Sonnet 5
- 6Claude Sonnet 5.5 vs. Claude Haiku 5.5
- 7Claude Sonnet 5.5 vs. Claude Opus 5
- 8Claude Sonnet 5 vs. DeepSeek-V4.1-Flash
- 9Claude Sonnet 5.5 vs. Grok 4.7
Show all 69 comparisons
- 10Claude Sonnet 5.5 vs. GPT-5.6 Terra
- 11Claude Sonnet 5 vs. GPT-6 Luna
- 12Claude Sonnet 5.5 vs. Claude Fable 5.1
- 13Claude Sonnet 5.5 vs. Gemini 3.1 Pro Preview
- 14Claude Sonnet 5.5 vs. DeepSeek V4.1 Flash 1017
- 15Claude Sonnet 5.5 vs. GPT-6 Luna
- 16Claude Sonnet 5.5 vs. Kimi K3
- 17Claude Sonnet 5.5 vs. Qwen 3.8 27B
- 18Claude Sonnet 5.5 vs. Claude Opus 4.6
- 19Claude Sonnet 5.5 vs. DeepSeek-V4-Pro
- 20Claude Sonnet 5.5 vs. GPT-5.6 Luna
- 21Claude Sonnet 5.5 vs. GLM-5.2
- 22Claude Sonnet 5.5 vs. DeepSeek-V4-Flash
- 23Claude Sonnet 5.5 vs. GPT-6 Sol
- 24Claude Sonnet 5.5 vs. Gemini 3.5 Flash-Lite
- 25Claude Sonnet 5.5 vs. Claude Fable 5
- 26Claude Sonnet 5.5 vs. Qwen 3.8 Max 0902
- 27Claude Sonnet 5.5 vs. Gemini 3.6 Flash
- 28Claude Sonnet 5.5 vs. Claude Sonnet 4.6
- 29Claude Sonnet 5.5 vs. GPT-5.6 Sol
- 30Claude Sonnet 5.5 vs. GLM-5.3-Flash
- 31Claude Haiku 5.5 vs. Claude Sonnet 5
- 32Claude Sonnet 5 vs. DeepSeek V4.1 Flash 1017
- 33Claude Sonnet 5.5 vs. Muse Spark 1.3
- 34Claude Sonnet 5.5 vs. Claude Opus 4.7
- 35Claude Sonnet 5 vs. GPT-6 Astra
- 36Claude Sonnet 5.5 vs. GPT-6 Astra
- 37Claude Sonnet 5.5 vs. Claude Opus 4.8
- 38Claude Sonnet 5 vs. GPT-5.6 Luna
- 39Claude Sonnet 5 vs. Gemini 3.8 Flash
- 40Claude Sonnet 5 vs. Kimi K3
- 41Claude Opus 5 vs. Claude Sonnet 5
- 42Claude Sonnet 5 vs. GPT-6 Sol
- 43Claude Sonnet 5 vs. Qwen 3.8 Max 0902
- 44Claude Sonnet 5.5 vs. Kimi K2.6
- 45Claude Sonnet 5.5 vs. Grok 4.6
- 46Claude Sonnet 5 vs. MiMo-V2.5
- 47Claude Sonnet 5.5 vs. GPT-6.1 Sol
- 48Claude Sonnet 5.5 vs. Claude Sonnet 4.5
- 49Claude Sonnet 5 vs. Claude Haiku 4.5
- 50Claude Sonnet 5.5 vs. Gemini 3.7 Flash
- 51Claude Sonnet 5 vs. Mistral Large 4
- 52Claude Sonnet 5.5 vs. Claude Haiku 4.5
- 53Claude Sonnet 5.5 vs. Mistral Large 4
- 54Claude Sonnet 5.5 vs. Mistral Medium 3.5
- 55Claude Sonnet 5.5 vs. GPT-5.4
- 56Claude Sonnet 5.5 vs. Gemini 3.5 Flash
- 57Claude Sonnet 5 vs. Claude Opus 4.8
- 58Claude Sonnet 5.5 vs. GPT-5.5
- 59Claude Sonnet 5 vs. GPT-5.5
- 60Claude Sonnet 5.5 vs. Claude Opus 4.5
- 61Claude Sonnet 5.5 vs. Kimi K3.1 Pro
- 62Claude Sonnet 5 vs. Gemini 4 Argon
- 63Claude Sonnet 5.5 vs. GPT-6.1 Terra
- 64Claude Sonnet 5.5 vs. Muse Wonder Full
- 65Claude Sonnet 5 vs. GPT-6.1 Sol
- 66Claude Sonnet 5.5 vs. Gemini 4 Argon
- 67Claude Sonnet 5 vs. GPT-6.1 Terra
- 68Claude Sonnet 5.5 vs. Gemini 4 Carbon
- 69Claude Sonnet 5 vs. Kimi K3.1 Pro