GPT-6.1 Terravs.GPT-5.6 Luna
Is the higher price worth it?
If you need top performance, yes: GPT-6.1 Terra is clearly ahead in the overall index and costs 5 times (input) and 4.2 times (output) as much per token.
67
GPT-6.1 Terra
Rank 12 to 27
36
GPT-5.6 Luna
Rank 32 to 41
91
GPT-6.1 Terra
fairly slow
127
GPT-5.6 Luna
fairly fast
$2
GPT-6.1 Terra
fairly expensive
$0.45
GPT-5.6 Luna
cheap
GPT-6.1 Terra
- Subscription
Subscriptions in Germany: n/a
- Via API
$1 input, $5 output per 1M tokens.
GPT-5.6 Luna
- Subscription
Free to use at OpenAI (ChatGPT Free), more from €8 a month (ChatGPT Go). Through other providers from ≈ €1.06 a month (Command Code Go, with limited credits). 58 plans in Germany.
- Via API
$0.20 input, $1.20 output per 1M tokens, cheaper since Oct 16, 2026 (before $0.22 and $1.32).
- Note
- There is a successor: GPT-6 Luna (rank 31 to 39, $0.10 input, $0.50 output).
Overall index with data through Oct 29, 2026 · Prices from Oct 29, 2026 · Speed: measured by Artificial Analysis · Subscriptions as of Oct 24, 2026 · Subscription prices incl. VAT
Where is the difference?
Values from 0 to 100 per task area. We only name a winner when the gap is large enough and there are enough tests.
GPT-6.1 Terra ahead: 4GPT-5.6 Luna ahead: 0level: 3too little data: 3of 10 areas
AreaGPT-6.1 TerraGPT-5.6 Luna0 to 100, higher is betterResult
Areas in the overall index
CodingGPT-6.1 Terra aheadGPT-6.1 Terra: 84GPT-5.6 Luna: 44
ReasoningGPT-6.1 Terra aheadGPT-6.1 Terra: 88GPT-5.6 Luna: 46
Mathematicsonly GPT-5.6 Luna has a scoreGPT-6.1 Terra: not enough dataGPT-5.6 Luna: 38
KnowledgeGPT-6.1 Terra aheadGPT-6.1 Terra: 80GPT-5.6 Luna: 22
AgentslevelGPT-6.1 Terra: 57GPT-5.6 Luna: 44
Generalonly GPT-5.6 Luna has a scoreGPT-6.1 Terra: not enough dataGPT-5.6 Luna: 27
MultimodalGPT-6.1 Terra aheadGPT-6.1 Terra: 70GPT-5.6 Luna: 28
Specialist fields
FinancelevelGPT-6.1 Terra: 45GPT-5.6 Luna: 47
LegallevelGPT-6.1 Terra: 8GPT-5.6 Luna: 39
Healthonly GPT-5.6 Luna has a scoreGPT-6.1 Terra: not enough dataGPT-5.6 Luna: 29
Show 2 more areas that do not count toward the overall index
AreaGPT-6.1 TerraGPT-5.6 Luna0 to 100, higher is betterResult
Cybersecurityonly GPT-5.6 Luna has a scoreGPT-6.1 Terra: not enough dataGPT-5.6 Luna: 56
Productivityonly GPT-5.6 Luna has a scoreGPT-6.1 Terra: not enough dataGPT-5.6 Luna: 29
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.
Pelican on a bicycle
A community classic for free-form SVG drawing.
GPT-6.1 Terra
Not tested yet
GPT-5.6 Luna
Reasoning (requested): high
Current attempt
- Run date
- Sep 7, 2026
- API provider
- openrouter
- Requested API model
- openai/gpt-5.6-luna
- API model reported in response
- openai/gpt-5.6-luna
- Reasoning setting
- high
- Pinned endpoint
- OpenAI | openai/gpt-5.6-luna-20260709
- Temperature
- Provider default
- Token limit including reasoning
- 8,192 tokens
- Test protocol
- community-visual-tests-v1
- Technical checks
- Passed, not a quality rating
- Response time
- 49.9 s
Visually reviewed. This individual test does not establish overall model quality.
Prompt and test conditions
Generate an SVG of a pelican riding a bicycle
Token limit including reasoning: 8,192 tokens
Task origin (Simon Willison)SVG short test
There is no shared test round for this selection. Results from different rounds are not mixed.
All data side by side
The better value is bold. For the overall index only when the gap is clear.
| Metric | GPT-6.1 Terra | GPT-5.6 Luna |
|---|---|---|
| Intelligence | ||
| Overall index0 to 100, higher is better | 67 | 36 |
| Rank | Rank 12 to 27 of 95 | Rank 32 to 41 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $1above 272,000 tokens: $2 | $0.20above 272,000 tokens: $0.40 |
| Outputwhat the model writes | $5above 272,000 tokens: $7.50 | $1.20above 272,000 tokens: $1.80 |
| Speed | ||
| Tokens per second | 91 | 127 |
| 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 | Jun 1, 2026 | Feb 16, 2026 |
| Released | Oct 26, 2026 | Jul 9, 2026 |
| Availability | Active | Active |
| Open weights | no | no |
- GPT-6.1 Terra, 12-hour cache write: The table's cache-write rate covers 30-minute retention. With 12-hour retention it is $2.50 per 1M tokens through 272,000 input tokens, $5 above. Source
- GPT-6.1 Terra, Long-context billing: Above 272,000 input tokens, the higher rates apply to the entire request. Input and cache rates double, while output costs 1.5 times the standard rate. Source
- GPT-6.1 Terra, Batch and Flex pricing: 50% off standard pricing Source
- GPT-6.1 Terra, Fast pricing: Fast mode costs twice the standard price Source
- GPT-6.1 Terra, Regional processing: 10% surcharge over standard processing Source
Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis
Shared 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 TerraB: GPT-5.6 Luna
CritPt v2Overall · higher is betterGPT-6.1 Terra: 4.9%GPT-5.6 Luna: 0.3%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,286.51 eloGPT-5.6 Luna: 928.23 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchOverall · All-pass · higher is betterGPT-6.1 Terra: 26%GPT-5.6 Luna: 36.5%Vals AIAs of 10/26/2026
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 76.0%GPT-5.6 Luna: 60.3%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchOverall · higher is betterGPT-6.1 Terra: 15.2%GPT-5.6 Luna: 24.8%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Overall · higher is betterGPT-6.1 Terra: 49.5%GPT-5.6 Luna: 11.6%Vals AIAs of 10/26/2026
Vibe Code Bench v1.1Overall · higher is betterGPT-6.1 Terra: 84%GPT-5.6 Luna: 77.1%Vals AIAs of 10/26/2026
CritPt v2Overall · higher is betterGPT-6.1 Terra: 28.0%GPT-5.6 Luna: 20.6%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,476.05 eloGPT-5.6 Luna: 1,468.83 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchAdministrative / Regulatory · All-pass · higher is betterGPT-6.1 Terra: 45.5%GPT-5.6 Luna: 48.5%Vals AIAs of 10/26/2026
Show 49 more benchmarks
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 84.7%GPT-5.6 Luna: 78.6%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchControversy & Precedence Analysis · higher is betterGPT-6.1 Terra: 5.9%GPT-5.6 Luna: 10%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Hardware · higher is betterGPT-6.1 Terra: 26.7%GPT-5.6 Luna: 0%Vals AIAs of 10/26/2026
CritPt v2Overall · higher is betterGPT-6.1 Terra: 21.4%GPT-5.6 Luna: 4.9%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,325.12 eloGPT-5.6 Luna: 1,138.33 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchAdministrative / Regulatory · Weighted partial credit · higher is betterGPT-6.1 Terra: 84.8%GPT-5.6 Luna: 87.5%Vals AIAs of 10/26/2026
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 82.8%GPT-5.6 Luna: 75.8%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchControversy & Precedence Analysis · higher is betterGPT-6.1 Terra: 42.5%GPT-5.6 Luna: 61.2%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Media · higher is betterGPT-6.1 Terra: 58.3%GPT-5.6 Luna: 0%Vals AIAs of 10/26/2026
CritPt v2Overall · higher is betterGPT-6.1 Terra: 15.1%GPT-5.6 Luna: 2.6%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,204.16 eloGPT-5.6 Luna: 1,002.1 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchBusiness & Commercial · All-pass · higher is betterGPT-6.1 Terra: 16.3%GPT-5.6 Luna: 32.6%Vals AIAs of 10/26/2026
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 82.5%GPT-5.6 Luna: 74.0%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchCurrent & Temporal Analysis · higher is betterGPT-6.1 Terra: 22.1%GPT-5.6 Luna: 33%Vals AIAs of 10/26/2026
Terminal-Bench 4.0ML · higher is betterGPT-6.1 Terra: 42.4%GPT-5.6 Luna: 18.2%Vals AIAs of 10/26/2026
CritPt v2Overall · higher is betterGPT-6.1 Terra: 26.6%GPT-5.6 Luna: 20.6%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,415.29 eloGPT-5.6 Luna: 1,408.75 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchBusiness & Commercial · Weighted partial credit · higher is betterGPT-6.1 Terra: 75.9%GPT-5.6 Luna: 87.3%Vals AIAs of 10/26/2026
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 83.8%GPT-5.6 Luna: 78.6%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchCurrent & Temporal Analysis · higher is betterGPT-6.1 Terra: 53.1%GPT-5.6 Luna: 60.1%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Operations · higher is betterGPT-6.1 Terra: 40.7%GPT-5.6 Luna: 7.4%Vals AIAs of 10/26/2026
CritPt v2Overall · higher is betterGPT-6.1 Terra: 25.7%GPT-5.6 Luna: 16.6%Artificial AnalysisAs of 10/29/2026
GDPval-AAOverall · higher is betterGPT-6.1 Terra: 1,353.15 eloGPT-5.6 Luna: 1,338.88 eloArtificial AnalysisAs of 10/29/2026
Legal Research BenchCivil Litigation · All-pass · higher is betterGPT-6.1 Terra: 14.8%GPT-5.6 Luna: 25.9%Vals AIAs of 10/26/2026
MMMU-ProOverall · higher is betterGPT-6.1 Terra: 83.8%GPT-5.6 Luna: 77.6%Artificial AnalysisAs of 10/29/2026
Tax Agent BenchFact-Pattern Analysis · higher is betterGPT-6.1 Terra: 16.1%GPT-5.6 Luna: 25.6%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Science · higher is betterGPT-6.1 Terra: 54.8%GPT-5.6 Luna: 14.3%Vals AIAs of 10/26/2026
Legal Research BenchCivil Litigation · Weighted partial credit · higher is betterGPT-6.1 Terra: 80.6%GPT-5.6 Luna: 84.8%Vals AIAs of 10/26/2026
Tax Agent BenchFact-Pattern Analysis · higher is betterGPT-6.1 Terra: 47.2%GPT-5.6 Luna: 59.6%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Security · higher is betterGPT-6.1 Terra: 80%GPT-5.6 Luna: 6.7%Vals AIAs of 10/26/2026
Legal Research BenchConstitutional / Civil Rights · All-pass · higher is betterGPT-6.1 Terra: 23.7%GPT-5.6 Luna: 34.2%Vals AIAs of 10/26/2026
Tax Agent BenchForms & Filings · higher is betterGPT-6.1 Terra: 12.6%GPT-5.6 Luna: 13.3%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Software · higher is betterGPT-6.1 Terra: 50%GPT-5.6 Luna: 14.8%Vals AIAs of 10/26/2026
Legal Research BenchConstitutional / Civil Rights · Weighted partial credit · higher is betterGPT-6.1 Terra: 78%GPT-5.6 Luna: 86.2%Vals AIAs of 10/26/2026
Tax Agent BenchForms & Filings · higher is betterGPT-6.1 Terra: 51.7%GPT-5.6 Luna: 58.5%Vals AIAs of 10/26/2026
Legal Research BenchCriminal · All-pass · higher is betterGPT-6.1 Terra: 17.5%GPT-5.6 Luna: 29.8%Vals AIAs of 10/26/2026
Tax Agent BenchNumbers & Calculations · higher is betterGPT-6.1 Terra: 19.1%GPT-5.6 Luna: 30%Vals AIAs of 10/26/2026
Legal Research BenchCriminal · Weighted partial credit · higher is betterGPT-6.1 Terra: 76.2%GPT-5.6 Luna: 82.2%Vals AIAs of 10/26/2026
Tax Agent BenchNumbers & Calculations · higher is betterGPT-6.1 Terra: 63.9%GPT-5.6 Luna: 71.8%Vals AIAs of 10/26/2026
Legal Research BenchFamily · All-pass · higher is betterGPT-6.1 Terra: 4.5%GPT-5.6 Luna: 18.2%Vals AIAs of 10/26/2026
Tax Agent BenchRule & Source Lookup · higher is betterGPT-6.1 Terra: 14.9%GPT-5.6 Luna: 36.7%Vals AIAs of 10/26/2026
Legal Research BenchFamily · Weighted partial credit · higher is betterGPT-6.1 Terra: 64.8%GPT-5.6 Luna: 78.4%Vals AIAs of 10/26/2026
Tax Agent BenchRule & Source Lookup · higher is betterGPT-6.1 Terra: 40.9%GPT-5.6 Luna: 54.3%Vals AIAs of 10/26/2026
Legal Research BenchHealth · All-pass · higher is betterGPT-6.1 Terra: 56.7%GPT-5.6 Luna: 70%Vals AIAs of 10/26/2026
Tax Agent BenchWeighted Pass · higher is betterGPT-6.1 Terra: 49.7%GPT-5.6 Luna: 60.8%Vals AIAs of 10/26/2026
Legal Research BenchHealth · Weighted partial credit · higher is betterGPT-6.1 Terra: 92.8%GPT-5.6 Luna: 93.8%Vals AIAs of 10/26/2026
Legal Research BenchImmigration · All-pass · higher is betterGPT-6.1 Terra: 9.1%GPT-5.6 Luna: 18.2%Vals AIAs of 10/26/2026
Legal Research BenchImmigration · Weighted partial credit · higher is betterGPT-6.1 Terra: 69.8%GPT-5.6 Luna: 78.6%Vals AIAs of 10/26/2026
Legal Research BenchOverall · Weighted partial credit · higher is betterGPT-6.1 Terra: 78.7%GPT-5.6 Luna: 85%Vals AIAs of 10/26/2026
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