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- GPT-6.1 Sol vs. GPT-5.6 Terra
OpenAILLM matchup
GPT-6.1 Solvs.GPT-5.6 Terra
Is the higher price worth it?
GPT-6.1 Sol performs better than GPT-5.6 Terra and is cheaper: GPT-5.6 Terra costs 1.2 times as much for output and about the same for input.
GPT-6.1 Sol
Rank 9
GPT-5.6 Terra
Rank 31
GPT-6.1 Sol
GPT-5.6 Terra
GPT-6.1 Sol
GPT-5.6 Terra
Above 272,000 tokens of context, GPT-6.1 Sol costs more: $4 input and $15 output per 1M tokens. Above 272,000 tokens of context, GPT-5.6 Terra costs more: $4 input and $18 output per 1M tokens.
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Where is the difference?
Strengths at a glance
GPT-6.1 SolGPT-5.6 TerraMedian of all ranked models
95 % range: GPT-6.1 Sol 113.7 to 127.5, GPT-5.6 Terra 98.7 to 110.4.
The same values and verdicts as the bars below. In the close-up the net starts at 80 points, just below the weaker model's lowest value; the reference group average is 100.
GPT-6.1 Sol is ahead in 8 of 10 areas, GPT-5.6 Terra in none.
GPT-6.1 Sol ahead: 8GPT-6.1 Sol slightly 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.
GPT-6.1 Sol vs. GPT-5.6 Terra 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.
GPT-6.1 Sol vs. GPT-5.6 Terra 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.
GPT-6.1 Sol

Oct 1, 2026 · 84 s · $0.04
Test details
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- openai/gpt-6.1-sol
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,583 tokens
- Cost of the attempt
- $0.0359
- Response time
- 83.6 s
- API model reported in response
- openai/gpt-6.1-sol
- Pinned endpoint
- OpenAI | openai/gpt-6.1-sol-20260929
- 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 Terra

Sep 7, 2026 · 65 s · $0.04
Test details
- Run date
- Sep 7, 2026
- API provider
- openrouter
- Requested API model
- openai/gpt-5.6-terra
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,373 tokens
- Cost of the attempt
- $0.0405
- Response time
- 64.6 s
- API model reported in response
- openai/gpt-5.6-terra
- Pinned endpoint
- OpenAI | openai/gpt-5.6-terra-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.
GPT-6.1 Sol
Unavailable in this round
GPT-5.6 Terra
Unavailable in this round
GPT-6.1 Sol and GPT-5.6 Terra 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
All data side by side
The better value is bold. For the overall index only when the gap is clear.
| Metric | GPT-6.1 Sol | GPT-5.6 Terra |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 117.5 | 100.9 |
| Rank | Rank 9 of 95 | Rank 31 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $2above 272,000 tokens: $4 | $2above 272,000 tokens: $4 |
| Outputwhat the model writes | $10above 272,000 tokens: $15 | $12above 272,000 tokens: $18 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.044 | $0.047 |
| Speed | ||
| Tokens per second | 54 | 80 |
| Technical | ||
| Context windowhow much text the model reads at once | 1.05 M tokens≈ 1,580 A4 pages | 1.05 M tokens≈ 1,580 A4 pages |
| Knowledge cutoff | Apr 30, 2026 | Feb 16, 2026 |
| Released | Sep 29, 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 106.5, rank 19$1 input and $5 output per 1M tokens
GPT-6.1 Sol vs. GPT-6.1 TerraOverall index 127.0, rank 2$2 input and $10 output per 1M tokens
GPT-6.1 Sol vs. Gemini 4 CarbonOverall index 130.9, rank 1$8 input and $40 output per 1M tokens
GPT-6.1 Sol 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: GPT-6.1 SolB: GPT-5.6 Terra
Show 54 more benchmarks
More comparisons
Compare GPT-6.1 Sol and GPT-5.6 Terra with the models people compare them with most often.
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Predecessor and successor
The most popular comparisons
- 1GPT-6 Luna vs. GPT-5.6 Terra
- 2Claude Sonnet 5.5 vs. GPT-5.6 Terra
- 3GPT-6.1 Sol vs. GPT-5.6 Sol
- 4Claude Opus 5.5 vs. GPT-5.6 Terra
- 5GPT-5.6 Terra vs. DeepSeek-V4.1-Flash
- 6GPT-6 Astra vs. GPT-5.6 Terra
- 7GPT-6 Sol vs. GPT-5.6 Terra
- 8GPT-6.1 Sol vs. GPT-6.1 Terra
- 9Claude Opus 5 vs. GPT-5.6 Terra
Show all 56 comparisons
- 10GPT-6.1 Sol vs. GPT-6 Astra
- 11GPT-5.6 Terra vs. Grok 4.7
- 12GPT-6.1 Sol vs. Gemini 3.8 Flash
- 13Claude Haiku 5.5 vs. GPT-5.6 Terra
- 14GPT-5.6 Terra vs. DeepSeek V4.1 Flash 1017
- 15Claude Opus 5.5 vs. GPT-6.1 Sol
- 16Claude Sonnet 5.5 vs. GPT-6.1 Sol
- 17GPT-5.6 Terra vs. Gemini 3.7 Flash
- 18GPT-5.6 Terra vs. Gemini 3.1 Pro Preview
- 19GPT-5.6 Terra vs. GPT-5.4
- 20GPT-6.1 Sol vs. GLM-5.3-Flash
- 21GPT-6.1 Sol vs. GPT-6 Luna
- 22GPT-6.1 Sol vs. Gemini 4 Carbon
- 23GPT-6.1 Sol vs. DeepSeek-V4.1-Flash
- 24Claude Opus 4.8 vs. GPT-6.1 Sol
- 25GPT-6.1 Sol vs. Gemini 4 Argon
- 26GPT-6.1 Sol vs. Kimi K3.1 Pro
- 27GPT-6.1 Sol vs. DeepSeek-V4-Flash
- 28GPT-6.1 Sol vs. GPT-5.4 mini
- 29GPT-6.1 Sol vs. GPT-5.4
- 30GPT-6.1 Sol vs. DeepSeek V4.1 Flash 1017
- 31GPT-6.1 Sol vs. Qwen 3.8 Max 0902
- 32Claude Sonnet 4.6 vs. GPT-6.1 Sol
- 33Claude Opus 4.6 vs. GPT-6.1 Sol
- 34GPT-6.1 Sol vs. GPT-5.6 Luna
- 35Claude Sonnet 5 vs. GPT-6.1 Sol
- 36Claude Opus 5 vs. GPT-6.1 Sol
- 37GPT-6.1 Sol vs. GPT-5.5
- 38Claude Haiku 5.5 vs. GPT-6.1 Sol
- 39GPT-6.1 Sol vs. Grok 4.7
- 40Claude Sonnet 4.5 vs. GPT-6.1 Sol
- 41GPT-6.1 Sol vs. Gemini 3.5 Flash
- 42Claude Opus 4.7 vs. GPT-6.1 Sol
- 43GPT-6.1 Sol vs. GLM-5.3
- 44Claude Fable 5.2 vs. GPT-6.1 Sol
- 45GPT-5.6 Terra vs. Gemini 4 Argon
- 46GPT-6.1 Sol vs. Gemini 3.7 Flash
- 47GPT-6.1 Sol vs. Qwen 3.8 27B
- 48Claude Fable 5.1 vs. GPT-6.1 Sol
- 49GPT-6.1 Sol vs. Gemini 3.1 Pro Preview
- 50GPT-6.1 Sol vs. Gemini 3.6 Flash
- 51GPT-6.1 Sol vs. Kimi K3
- 52Claude Fable 5 vs. GPT-6.1 Sol
- 53GPT-6.1 Sol vs. DeepSeek-V4-Pro
- 54GPT-6.1 Sol vs. Muse Wonder
- 55Claude Haiku 4.5 vs. GPT-6.1 Sol
- 56Claude Opus 4.5 vs. GPT-6.1 Sol