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AnthropicOpenAILLM matchup
Claude Sonnet 5.5vs.GPT-6 Astra
Which one is better?
Claude Sonnet 5.5 and GPT-6 Astra perform about equally well, but GPT-6 Astra costs 5 times as much.
Claude Sonnet 5.5
Rank 5
GPT-6 Astra
Rank 7
Claude Sonnet 5.5
GPT-6 Astra
Claude Sonnet 5.5
GPT-6 Astra
Claude Sonnet 5.5
Rank 21 of 478
GPT-6 Astra
Rank 10 of 478
Above 272,000 tokens of context, GPT-6 Astra costs more: $20 input and $75 output per 1M tokens.
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Where is the difference?
Strengths at a glance
Sonnet 5.5GPT-6 Astra
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, GPT-6 Astra 115.4 to 133.2.
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, GPT-6 Astra in 2.
Sonnet 5.5 ahead: 5level: 2too little data: 1GPT-6 Astra ahead: 2
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. GPT-6 Astra 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. GPT-6 Astra 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.
GPT-6 Astra

Sep 7, 2026 · 142 s · $0.20
Test details
- Run date
- Sep 7, 2026
- API provider
- openrouter
- Requested API model
- openai/gpt-6-astra
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,966 tokens
- Cost of the attempt
- $0.1985
- Response time
- 141.7 s
- API model reported in response
- openai/gpt-6-astra
- Pinned endpoint
- OpenAI | openai/gpt-6-astra-20260903
- 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
GPT-6 Astra
Unavailable in this round
Claude Sonnet 5.5 and GPT-6 Astra 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.
GPT-6 Astra is more popular than Claude Sonnet 5.5: 84 to 79 out of 100.
Over time
Weekly values from October 18, 2026 to November 13, 2026
Claude Sonnet 5.5GPT-6 Astra
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 | GPT-6 Astra |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 121.9 | 119.6 |
| Rank | Rank 5 of 95 | Rank 7 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $2 | $10above 272,000 tokens: $20 |
| Outputwhat the model writes | $10 | $50above 272,000 tokens: $75 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.038 | $0.26 |
| Speed | ||
| Tokens per second | 103 | 58 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 79Rank 21 of 478 | 84Rank 10 of 478 |
| Technical | ||
| Context windowhow much text the model reads at once | 1 M tokens≈ 1,500 A4 pages | 1.05 M tokens≈ 1,580 A4 pages |
| Knowledge cutoff | June 2026 | Apr 30, 2026 |
| Released | Sep 28, 2026 | Sep 3, 2026 |
| Availability | Active | Limited access |
| 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: GPT-6 Astra
Show 54 more benchmarks
More comparisons
Compare Claude Sonnet 5.5 and GPT-6 Astra 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 Sonnet 5.5 vs. Gemini 3.8 Flash
- 3Claude Sonnet 5.5 vs. DeepSeek-V4.1-Flash
- 4Claude Opus 5.5 vs. Claude Sonnet 5.5
- 5Claude Sonnet 5.5 vs. GLM-5.3
- 6Claude Sonnet 5.5 vs. Claude Haiku 5.5
- 7Claude Sonnet 5.5 vs. Claude Opus 5
- 8GPT-6 Astra vs. GPT-6 Luna
- 9GPT-6 Astra vs. DeepSeek-V4.1-Flash
Show all 79 comparisons
- 10Claude Sonnet 5.5 vs. Grok 4.7
- 11Claude Sonnet 5.5 vs. GPT-5.6 Terra
- 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
- 15GPT-6 Astra vs. Kimi K3
- 16Claude Sonnet 5.5 vs. GPT-6 Luna
- 17Claude Sonnet 5.5 vs. Kimi K3
- 18GPT-6 Astra vs. GPT-6 Sol
- 19Claude Sonnet 5.5 vs. Qwen 3.8 27B
- 20GPT-6 Astra vs. GPT-5.6 Terra
- 21Claude Sonnet 5.5 vs. Claude Opus 4.6
- 22Claude Sonnet 5.5 vs. DeepSeek-V4-Pro
- 23Claude Sonnet 5.5 vs. GPT-5.6 Luna
- 24GPT-6 Astra vs. DeepSeek-V4-Flash
- 25GPT-6 Astra vs. GLM-5.3-Flash
- 26Claude Sonnet 5.5 vs. GLM-5.2
- 27Claude Sonnet 5.5 vs. DeepSeek-V4-Flash
- 28Claude Opus 5 vs. GPT-6 Astra
- 29Claude Sonnet 5.5 vs. GPT-6 Sol
- 30GPT-6 Astra vs. Qwen 3.8 27B
- 31Claude Sonnet 5.5 vs. Gemini 3.5 Flash-Lite
- 32Claude Sonnet 5.5 vs. Claude Fable 5
- 33Claude Sonnet 5.5 vs. Qwen 3.8 Max 0902
- 34Claude Sonnet 5.5 vs. Gemini 3.6 Flash
- 35Claude Sonnet 5.5 vs. Claude Sonnet 4.6
- 36Claude Sonnet 5.5 vs. GPT-5.6 Sol
- 37Claude Sonnet 5.5 vs. GLM-5.3-Flash
- 38GPT-6 Astra vs. Gemini 3.8 Flash
- 39GPT-6.1 Sol vs. GPT-6 Astra
- 40GPT-6 Astra vs. Gemini 4 Argon
- 41Claude Sonnet 5.5 vs. Muse Spark 1.3
- 42Claude Opus 4.8 vs. GPT-6 Astra
- 43Claude Sonnet 5.5 vs. Claude Opus 4.7
- 44Claude Fable 5.1 vs. GPT-6 Astra
- 45GPT-6 Astra vs. GPT-5.6 Luna
- 46GPT-6 Astra vs. GLM-5.2
- 47Claude Sonnet 5 vs. GPT-6 Astra
- 48Claude Sonnet 5.5 vs. Claude Opus 4.8
- 49GPT-6 Astra vs. Grok 4.7
- 50Claude Haiku 5.5 vs. GPT-6 Astra
- 51GPT-6 Astra vs. DeepSeek V4.1 Flash 1017
- 52GPT-6 Astra vs. Qwen 3.8 Max 0902
- 53Claude Opus 4.6 vs. GPT-6 Astra
- 54Claude Sonnet 5.5 vs. Kimi K2.6
- 55Claude Sonnet 4.6 vs. GPT-6 Astra
- 56Claude Sonnet 5.5 vs. Grok 4.6
- 57Claude Sonnet 5.5 vs. GPT-6.1 Sol
- 58Claude Sonnet 5.5 vs. Claude Sonnet 4.5
- 59Claude Sonnet 5.5 vs. Gemini 3.7 Flash
- 60Claude Sonnet 5.5 vs. Claude Haiku 4.5
- 61Claude Sonnet 5.5 vs. Mistral Large 4
- 62Claude Sonnet 5.5 vs. Mistral Medium 3.5
- 63Claude Fable 5 vs. GPT-6 Astra
- 64GPT-6.1 Terra vs. GPT-6 Astra
- 65GPT-6 Astra vs. GPT-5.4
- 66Claude Sonnet 5.5 vs. GPT-5.4
- 67Claude Sonnet 5.5 vs. Gemini 3.5 Flash
- 68Claude Sonnet 5.5 vs. GPT-5.5
- 69Claude Opus 4.7 vs. GPT-6 Astra
- 70Claude Opus 4.5 vs. GPT-6 Astra
- 71Claude Sonnet 5.5 vs. Claude Opus 4.5
- 72GPT-6 Astra vs. Muse Wonder Full
- 73Claude Sonnet 5.5 vs. Kimi K3.1 Pro
- 74GPT-6 Astra vs. Gemini 4 Carbon
- 75Claude Sonnet 5.5 vs. GPT-6.1 Terra
- 76Claude Sonnet 5.5 vs. Muse Wonder Full
- 77GPT-6 Astra vs. Kimi K3.1 Pro
- 78Claude Sonnet 5.5 vs. Gemini 4 Argon
- 79Claude Sonnet 5.5 vs. Gemini 4 Carbon