GPT-6.1 Sol vs GPT-6 Luna
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Following instructions
Wins 0 of 8 areas
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GPT-6.1 Sol is the stronger all-rounder.GPT-6 Luna is cheaper.
Scores updated · 39 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- ReasoningHard problems that need careful thinking50GPT-6.1 Sol5 of 5 tests
- CodingWriting and fixing software30GPT-6.1 Sol3 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up30GPT-6.1 Sol3 of 3 tests
- MathCompetition and research-level math30GPT-6.1 Sol3 of 3 tests
- AgentsCarrying out multi-step tasks on its own20GPT-6.1 Sol2 of 2 tests
- Images and chartsUnderstanding pictures, charts and video20GPT-6.1 Sol2 of 2 tests
- Following instructionsDoing exactly what it is asked10GPT-6.1 Sol1 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Long documents and following instructions rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
GPT-6 Luna costs 95% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-6.1 Sol pulls ahead
- Solves new puzzle games it has never seenARC-AGI-3+52.6points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+43.9points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+43.5points ahead
Where GPT-6 Luna pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 39 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6.1 Sol
- LMArena · WebDevGPT-6.1 Sol by 166 rating points17431577+166 rating
- LiveBench · Agentic CodingGPT-6.1 Sol by 3.454.551.2+3.4
- LiveBench · CodingGPT-6.1 Sol by 1.480.479+1.4
- SciCodetie54.254.6tie
AgentsGPT-6.1 Sol
- Terminal-Bench 4.0GPT-6.1 Sol by 43.556.112.6+43.5
- GDPValGPT-6.1 Sol by 8.154.746.6+8.1
ReasoningGPT-6.1 Sol
- ARC-AGI-3GPT-6.1 Sol by 52.652.70.1+52.6
- ARC-AGI-2GPT-6.1 Sol by 34.994.259.3+34.9
- Humanity's Last ExamGPT-6.1 Sol by 14.452.938.5+14.4
- CritPtGPT-6.1 Sol by 12.331.719.4+12.3
- LiveBench · ReasoningGPT-6.1 Sol by 10.892.681.8+10.8
FactsGPT-6.1 Sol
- SimpleQA VerifiedGPT-6.1 Sol by 32.573.941.4+32.5
- AA-Omniscience · Non-hallucinationGPT-6.1 Sol by 22.445.723.3+22.4
- AA-Omniscience · AccuracyGPT-6.1 Sol by 18.362.143.8+18.3
Images and chartsGPT-6.1 Sol
- LMArena · VisionGPT-6.1 Sol by 75 rating points12861211+75 rating
- MMMU-ProGPT-6.1 Sol by 6.38679.7+6.3
MathGPT-6.1 Sol
- FrontierMath Tier 4GPT-6.1 Sol by 43.910056.1+43.9
- FrontierMath Tiers 1-3 (v2)GPT-6.1 Sol by 14.793.779+14.7
- LiveBench · MathematicsGPT-6.1 Sol by 7.796.889.1+7.7
Following instructionsGPT-6.1 Sol
- LiveBench · Instruction FollowingGPT-6.1 Sol by 18.374.255.9+18.3
Other results18 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- Terminal-Bench-Science 0.1GPT-6.1 Sol by 49.558.18.6+49.5
- Terminal-Bench 4.0GPT-6.1 Sol by 41.858.216.4+41.8
- AA-OmniscienceGPT-6.1 Sol by 40.841.50.7+40.8
- HLE-DiamondGPT-6.1 Sol by 36.658.822.2+36.6
- CritPt v2 HardGPT-6.1 Sol by 2769.542.5+27
- OSWorld 2.0GPT-6.1 Sol by 18.771.452.7+18.7
- livebench_languageGPT-6.1 Sol by 16.390.173.8+16.3
- AA IntelligenceGPT-6.1 Sol by 13.751.838.1+13.7
- ARC-AGI-1GPT-6.1 Sol by 9.896.586.7+9.8
- livebench_data_analysisGPT-6.1 Sol by 9.382.773.4+9.3
- DeepSWE 1.1GPT-6.1 Sol by 8.675.266.6+8.6
- GDP (Surge AI)GPT-6.1 Sol by 8.23122.8+8.2
- HealthBench Hard length-adjustedGPT-6.1 Sol by 4.836.231.4+4.8
- HealthBench length-adjustedGPT-6.1 Sol by 458.554.5+4
- HealthBenchGPT-6.1 Sol by 3.958.554.6+3.9
- HealthBench Professional length-adjustedGPT-6.1 Sol by 3.464.260.8+3.4
- HealthBench ProfessionalGPT-6.1 Sol by 3.265.161.9+3.2
- HealthBench Consensus length-adjustedtie9695.9tie
Questions people ask
Which is better, GPT-6.1 Sol or GPT-6 Luna?
GPT-6.1 Sol wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and following instructions. GPT-6 Luna wins none, but costs 95% less. They are level on long documents.
Which is better for coding?
GPT-6.1 Sol. It wins 3 of the 4 coding tests both models report; GPT-6 Luna wins none, and 1 is a tie.
Which is cheaper?
GPT-6.1 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-6 Luna costs $0.10 and $0.50. That makes GPT-6 Luna about 95% cheaper for the same work.
How do you compare the two?
We use the 39 benchmark tests both models have published scores on. The verdict counts the 21 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 18 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.