GPT-6.1 Sol vs Claude Opus 5
Wins 5 of 8 areas
Reasoning · Facts · Math · Long documents · Following instructions
Wins 1 of 8 areas
Coding
GPT-6.1 Sol is the stronger all-rounder.Claude Opus 5 is better at coding.
Both rank among the ten best models we track in reasoning and math.
Scores updated · 36 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 thinking51GPT-6.1 Sol5 of 6 tests
- 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
- Long documentsFinding answers in very long texts10GPT-6.1 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked10GPT-6.1 Sol1 of 1 test
- CodingWriting and fixing software13Claude Opus 53 of 4 tests
- AgentsCarrying out multi-step tasks on its own11Even1 each
- Images and chartsUnderstanding pictures, charts and video11Even1 each
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 85% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+26.8points ahead
- Solves new puzzle games it has never seenARC-AGI-3+22.5points ahead
- Short factual questions, answered correctlySimpleQA Verified+14points ahead
Where Claude Opus 5 pulls ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+10.6points ahead
- Real work tasks from 44 professionsGDPVal+6.4points ahead
- Code for real scientific research problemsSciCode+2.2points ahead
Every test, side by side
All 36 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 5
- LiveBench · Agentic CodingClaude Opus 5 by 10.654.565.2+10.6
- LMArena · WebDevGPT-6.1 Sol by 58 rating points17491691+58 rating
- SciCodeClaude Opus 5 by 2.254.256.4+2.2
- LiveBench · CodingClaude Opus 5 by 1.180.481.5+1.1
AgentsEven
- Terminal-Bench 4.0GPT-6.1 Sol by 7.156.149+7.1
- GDPValClaude Opus 5 by 6.454.761.1+6.4
ReasoningGPT-6.1 Sol
- ARC-AGI-3GPT-6.1 Sol by 22.552.730.2+22.5
- ARC-AGI-2GPT-6.1 Sol by 3.894.290.4+3.8
- CritPtGPT-6.1 Sol by 2.631.729.1+2.6
- SimpleBenchGPT-6.1 Sol by 2.382.980.6+2.3
- Humanity's Last ExamClaude Opus 5 by 252.954.9+2
- LiveBench · ReasoningGPT-6.1 Sol by 1.492.691.2+1.4
FactsGPT-6.1 Sol
- SimpleQA VerifiedGPT-6.1 Sol by 1473.959.9+14
- AA-Omniscience · Non-hallucinationGPT-6.1 Sol by 6.545.739.2+6.5
- AA-Omniscience · AccuracyGPT-6.1 Sol by 1.262.160.9+1.2
Images and chartsEven
- LMArena · VisionClaude Opus 5 by 32 rating points12881320+32 rating
- MMMU-ProGPT-6.1 Sol by 1.38684.7+1.3
MathGPT-6.1 Sol
- FrontierMath Tier 4GPT-6.1 Sol by 26.810073.2+26.8
- FrontierMath Tiers 1-3 (v2)GPT-6.1 Sol by 8.193.785.6+8.1
- LiveBench · MathematicsGPT-6.1 Sol by 1.196.895.7+1.1
Following instructionsGPT-6.1 Sol
- LiveBench · Instruction FollowingGPT-6.1 Sol by 10.474.263.8+10.4
Other results14 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.
- GDP (Surge AI)Claude Opus 5 by 53.53285.5+53.5
- Terminal-Bench-Science 0.1GPT-6.1 Sol by 285729+28
- HealthBenchClaude Opus 5 by 8.658.567.1+8.6
- livebench_data_analysisGPT-6.1 Sol by 8.182.774.5+8.1
- DeepSWE 1.1GPT-6.1 Sol by 6.475.268.8+6.4
- Terminal-Bench 4.0GPT-6.1 Sol by 6.458.251.8+6.4
- HiL-Bench (Tools-allowed)GPT-6.1 Sol by 5.362.357+5.3
- AA-OmniscienceGPT-6.1 Sol by 4.441.537.1+4.4
- HealthBench ProfessionalGPT-6.1 Sol by 4.464.259.8+4.4
- HealthBench Professional length-adjustedGPT-6.1 Sol by 4.464.259.8+4.4
- livebench_languageGPT-6.1 Sol by 1.490.188.7+1.4
- AA IntelligenceGPT-6.1 Sol by 151.850.8+1
- ARC-AGI-1Claude Opus 5 by 196.597.5+1
- OSWorld 2.0tie71.470.6tie
Questions people ask
Which is better, GPT-6.1 Sol or Claude Opus 5?
GPT-6.1 Sol wins five of the eight areas we test: reasoning, facts, math, long documents and following instructions. Claude Opus 5 wins coding. They are level on agents and images and charts.
Which is better for coding?
Claude Opus 5. It wins 3 of the 4 coding tests both models report; GPT-6.1 Sol wins 1.
Which is cheaper?
GPT-6.1 Sol costs $2.00 per million input tokens and $2.50 per million output tokens; Claude Opus 5 costs $5.00 and $25.00. That makes GPT-6.1 Sol about 85% cheaper for the same work.
How do you compare the two?
We use the 36 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 14 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.