GPT-6.1 Sol vs Claude Sonnet 5.5
Wins 4 of 8 areas
Reasoning · Facts · Math · Following instructions
Wins 2 of 8 areas
Coding · Agents
GPT-6.1 Sol wins more areas, narrowly.Claude Sonnet 5.5 is better at coding.
Both rank among the ten best models we track in math.
Scores updated · 32 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 thinking41GPT-6.1 Sol4 of 6 tests · 1 tie
- MathCompetition and research-level math20GPT-6.1 Sol2 of 3 tests · 1 tie
- FactsGetting facts right instead of making them up21GPT-6.1 Sol2 of 3 tests
- Following instructionsDoing exactly what it is asked10GPT-6.1 Sol1 of 1 test
- CodingWriting and fixing software04Claude Sonnet 5.54 of 4 tests
- AgentsCarrying out multi-step tasks on its own02Claude Sonnet 5.52 of 2 tests
- Images and chartsUnderstanding pictures, charts and video00Even0 each · 1 tie
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Images and charts, 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-6.1 Sol costs 63% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-6.1 Sol pulls ahead
- Solves new puzzle games it has never seenARC-AGI-3+28.4points ahead
- Short factual questions, answered correctlySimpleQA Verified+27.4points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+19.5points ahead
Where Claude Sonnet 5.5 pulls ahead
- Real work tasks from 44 professionsGDPVal+12.2points ahead
- Programming problems, refreshed regularlyLiveBench · Coding+11points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+7.5points ahead
Every test, side by side
All 32 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Sonnet 5.5
- LiveBench · CodingClaude Sonnet 5.5 by 1180.491.4+11
- SciCodeClaude Sonnet 5.5 by 6.854.261+6.8
- LMArena · WebDevClaude Sonnet 5.5 by 19 rating points17511770+19 rating
- LiveBench · Agentic CodingClaude Sonnet 5.5 by 1.754.556.3+1.7
AgentsClaude Sonnet 5.5
- GDPValClaude Sonnet 5.5 by 12.254.766.9+12.2
- Terminal-Bench 4.0Claude Sonnet 5.5 by 7.556.163.6+7.5
ReasoningGPT-6.1 Sol
- ARC-AGI-3GPT-6.1 Sol by 28.452.724.3+28.4
- ARC-AGI-2GPT-6.1 Sol by 10.394.283.9+10.3
- SimpleBenchGPT-6.1 Sol by 782.975.9+7
- Humanity's Last ExamClaude Sonnet 5.5 by 2.152.955+2.1
- LiveBench · ReasoningGPT-6.1 Sol by 192.691.6+1
- CritPttie31.731.4tie
FactsGPT-6.1 Sol
- SimpleQA VerifiedGPT-6.1 Sol by 27.473.946.5+27.4
- AA-Omniscience · AccuracyGPT-6.1 Sol by 8.162.154+8.1
- AA-Omniscience · Non-hallucinationClaude Sonnet 5.5 by 7.345.753+7.3
MathGPT-6.1 Sol
- FrontierMath Tier 4GPT-6.1 Sol by 19.510080.5+19.5
- FrontierMath Tiers 1-3 (v2)GPT-6.1 Sol by 4.993.788.8+4.9
- LiveBench · Mathematicstie96.896.1tie
Following instructionsGPT-6.1 Sol
- LiveBench · Instruction FollowingGPT-6.1 Sol by 17.474.256.8+17.4
Other results11 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.
- livebench_data_analysisGPT-6.1 Sol by 23.282.759.5+23.2
- Terminal-Bench 4.0Claude Sonnet 5.5 by 12.458.270.6+12.4
- livebench_languageGPT-6.1 Sol by 12.190.178+12.1
- AA-OmniscienceGPT-6.1 Sol by 9.241.532.3+9.2
- HealthBenchClaude Sonnet 5.5 by 6.958.565.4+6.9
- HealthBench ProfessionalClaude Sonnet 5.5 by 564.269.2+5
- HealthBench Professional length-adjustedClaude Sonnet 5.5 by 564.269.2+5
- AA IntelligenceClaude Sonnet 5.5 by 4.251.856+4.2
- DeepSWE 1.1GPT-6.1 Sol by 4.275.271+4.2
- Terminal-Bench-Science 0.1Claude Sonnet 5.5 by 2.95759.9+2.9
- ARC-AGI-1tie96.596.5tie
Questions people ask
Which is better, GPT-6.1 Sol or Claude Sonnet 5.5?
GPT-6.1 Sol wins four of the eight areas we test: reasoning, facts, math and following instructions. Claude Sonnet 5.5 wins coding and agents. They are level on images and charts and long documents.
Which is better for coding?
Claude Sonnet 5.5. It wins 4 of the 4 coding tests both models report; GPT-6.1 Sol wins none.
Which is cheaper?
GPT-6.1 Sol costs $2.00 per million input tokens and $2.50 per million output tokens; Claude Sonnet 5.5 costs $2.00 and $10.00. That makes GPT-6.1 Sol about 63% cheaper for the same work.
How do you compare the two?
We use the 32 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 11 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.