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- Claude Sonnet 5.5 vs. GPT-5.6 Luna
AnthropicOpenAILLM matchup
Claude Sonnet 5.5vs.GPT-5.6 Luna
Which one is better?
Claude Sonnet 5.5 performs better than GPT-5.6 Luna, but costs 10 times (input) and 8.3 times (output) as much.
Claude Sonnet 5.5
Rank 5
GPT-5.6 Luna
Rank 44
Claude Sonnet 5.5
GPT-5.6 Luna
Claude Sonnet 5.5
GPT-5.6 Luna
Claude Sonnet 5.5
Rank 21 of 478
GPT-5.6 Luna
Rank 12 of 478
Above 272,000 tokens of context, GPT-5.6 Luna costs more: $0.40 input and $1.80 output per 1M tokens.
Choose Claude Sonnet 5.5 for
No clear advantage for GPT-5.6 Luna.
Compare other versions
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Where is the difference?
Strengths at a glance
Sonnet 5.5GPT-5.6 LunaMedian of all ranked models
95 % range: Sonnet 5.5 119.5 to 130.9, GPT-5.6 Luna 86.6 to 106.2.
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, GPT-5.6 Luna 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.
Claude Sonnet 5.5 vs. GPT-5.6 Luna 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-5.6 Luna 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-5.6 Luna

Sep 7, 2026 · 50 s · $0.0038
Test details
- Run date
- Sep 7, 2026
- API provider
- openrouter
- Requested API model
- openai/gpt-5.6-luna
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,164 tokens
- Cost of the attempt
- $0.0038
- Response time
- 49.9 s
- API model reported in response
- openai/gpt-5.6-luna
- Pinned endpoint
- OpenAI | openai/gpt-5.6-luna-20260709
- 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-5.6 Luna
Unavailable in this round
Claude Sonnet 5.5 and GPT-5.6 Luna 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, GPT-5.6 Luna 83 out of 100.
Over time
Weekly values from October 18, 2026 to November 13, 2026
Claude Sonnet 5.5GPT-5.6 Luna
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-5.6 Luna |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 121.9 | 93.8 |
| Rank | Rank 5 of 95 | Rank 44 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $2 | $0.20above 272,000 tokens: $0.40 |
| Outputwhat the model writes | $10 | $1.20above 272,000 tokens: $1.80 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.038 | $0.008 |
| Speed | ||
| Tokens per second | 103 | 123 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 79Rank 21 of 478 | 83Rank 12 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 | Feb 16, 2026 |
| Released | Sep 28, 2026 | Jul 9, 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 95.6, rank 40$0.10 input and $0.50 output per 1M tokens
Sonnet 5.5 vs. GPT-6 LunaOverall index 110.5, rank 14$0.10 input and $0.50 output per 1M tokens
View profileOverall 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-5.6 Luna
Show 54 more benchmarks
More comparisons
Compare Claude Sonnet 5.5 and GPT-5.6 Luna 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. Claude Opus 5
- 7Claude Sonnet 5.5 vs. Grok 4.7
- 8Claude Sonnet 5.5 vs. GPT-5.6 Terra
- 9Claude Opus 5.5 vs. GPT-5.6 Luna
Show all 76 comparisons
- 10Claude Sonnet 5.5 vs. Claude Fable 5.1
- 11GPT-5.6 Luna vs. Gemini 3.8 Flash
- 12Claude Sonnet 5.5 vs. Gemini 3.1 Pro Preview
- 13Claude Sonnet 5.5 vs. DeepSeek V4.1 Flash 1017
- 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. GLM-5.2
- 20Claude Sonnet 5.5 vs. DeepSeek-V4-Flash
- 21GPT-5.6 Luna vs. DeepSeek-V4.1-Flash
- 22GPT-5.6 Luna vs. GPT-5.4 mini
- 23Claude Haiku 5.5 vs. GPT-5.6 Luna
- 24GPT-5.6 Luna vs. DeepSeek V4.1 Flash 1017
- 25Claude Sonnet 5.5 vs. GPT-6 Sol
- 26Claude Sonnet 5.5 vs. Gemini 3.5 Flash-Lite
- 27GPT-5.6 Luna vs. Qwen 3.8 27B
- 28Claude Sonnet 5.5 vs. Claude Fable 5
- 29Claude Sonnet 5.5 vs. Qwen 3.8 Max 0902
- 30Claude Sonnet 5.5 vs. Gemini 3.6 Flash
- 31Claude Sonnet 5.5 vs. Claude Sonnet 4.6
- 32Claude Sonnet 5.5 vs. GPT-5.6 Sol
- 33Claude Sonnet 5.5 vs. GLM-5.3-Flash
- 34GPT-5.6 Luna vs. Grok 4.7
- 35GPT-5.6 Luna vs. DeepSeek-V4-Flash
- 36Claude Opus 5 vs. GPT-5.6 Luna
- 37Claude Sonnet 5.5 vs. Muse Spark 1.3
- 38Claude Sonnet 5.5 vs. Claude Opus 4.7
- 39GPT-6 Astra vs. GPT-5.6 Luna
- 40GPT-5.6 Luna vs. GLM-5.3-Flash
- 41GPT-6 Sol vs. GPT-5.6 Luna
- 42Claude Sonnet 5.5 vs. GPT-6 Astra
- 43GPT-5.6 Luna vs. Kimi K3
- 44Claude Sonnet 5.5 vs. Claude Opus 4.8
- 45Claude Sonnet 5 vs. GPT-5.6 Luna
- 46GPT-5.6 Sol vs. GPT-5.6 Luna
- 47GPT-5.6 Luna vs. Gemini 3.5 Flash-Lite
- 48Claude Sonnet 5.5 vs. Kimi K2.6
- 49Claude Sonnet 4.5 vs. GPT-5.6 Luna
- 50Claude Sonnet 5.5 vs. Grok 4.6
- 51GPT-5.6 Luna vs. Gemini 3.7 Flash
- 52Claude Sonnet 5.5 vs. GPT-6.1 Sol
- 53Claude Sonnet 5.5 vs. Claude Sonnet 4.5
- 54GPT-5.6 Luna vs. Gemini 3.1 Pro Preview
- 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
- 59GPT-5.6 Luna vs. GPT-5.4
- 60GPT-5.6 Luna vs. Mistral Large 4
- 61Claude Sonnet 5.5 vs. GPT-5.4
- 62Claude Sonnet 5.5 vs. Gemini 3.5 Flash
- 63Claude Opus 4.6 vs. GPT-5.6 Luna
- 64Claude Sonnet 5.5 vs. GPT-5.5
- 65Claude Haiku 4.5 vs. GPT-5.6 Luna
- 66GPT-5.6 Luna vs. GPT-5.5
- 67Claude Opus 4.5 vs. GPT-5.6 Luna
- 68Claude Sonnet 5.5 vs. Claude Opus 4.5
- 69Claude Sonnet 5.5 vs. Kimi K3.1 Pro
- 70GPT-6.1 Terra vs. GPT-5.6 Luna
- 71GPT-6.1 Sol vs. GPT-5.6 Luna
- 72Claude Sonnet 5.5 vs. GPT-6.1 Terra
- 73Claude Sonnet 5.5 vs. Muse Wonder Full
- 74GPT-5.6 Luna vs. Gemini 4 Argon
- 75Claude Sonnet 5.5 vs. Gemini 4 Argon
- 76Claude Sonnet 5.5 vs. Gemini 4 Carbon