Claude Opus 4.8 vs GPT-6 Astra
Wins 1 of 8 areas
Images and charts
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Math · Long documents · Following instructions
GPT-6 Astra is the stronger all-rounder.Claude Opus 4.8 is cheaper and better at images and charts.
Scores updated · 41 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 thinking07GPT-6 Astra7 of 7 tests
- AgentsCarrying out multi-step tasks on its own04GPT-6 Astra4 of 4 tests
- CodingWriting and fixing software14GPT-6 Astra4 of 5 tests
- MathCompetition and research-level math03GPT-6 Astra3 of 3 tests
- FactsGetting facts right instead of making them up12GPT-6 Astra2 of 3 tests
- Long documentsFinding answers in very long texts01GPT-6 Astra1 of 1 test
- Following instructionsDoing exactly what it is asked01GPT-6 Astra1 of 1 test
- Images and chartsUnderstanding pictures, charts and video10Claude Opus 4.81 of 1 test
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.
Claude Opus 4.8 costs 50% 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 Astra pulls ahead
- Solves new puzzle games it has never seenARC-AGI-3+98.4points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+41.5points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+37.4points ahead
Where Claude Opus 4.8 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+12points ahead
- Programming problems, refreshed regularlyLiveBench · Coding+1.4points ahead
Every test, side by side
All 41 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6 Astra
- LMArena · WebDevGPT-6 Astra by 220 rating points15561776+220 rating
- LiveBench · Agentic CodingGPT-6 Astra by 6.850.557.3+6.8
- Terminal-Bench 2.1GPT-6 Astra by 3.884.688.4+3.8
- SciCodeGPT-6 Astra by 2.154.456.5+2.1
- LiveBench · CodingClaude Opus 4.8 by 1.481.880.4+1.4
AgentsGPT-6 Astra
- Terminal-Bench 4.0GPT-6 Astra by 37.421.759.1+37.4
- BrowseCompGPT-6 Astra by 7.284.391.5+7.2
- τ-Bench V3 · BankingGPT-6 Astra by 7.234.241.4+7.2
- GDPValGPT-6 Astra by 5.947.753.6+5.9
ReasoningGPT-6 Astra
- ARC-AGI-3GPT-6 Astra by 98.41.599.9+98.4
- ARC-AGI-2GPT-6 Astra by 22.972.195+22.9
- SimpleBenchGPT-6 Astra by 18.864.883.6+18.8
- CritPtGPT-6 Astra by 10.820.931.7+10.8
- Humanity's Last ExamGPT-6 Astra by 648.754.7+6
- GPQA DiamondGPT-6 Astra by 4.19296.1+4.1
- LiveBench · ReasoningGPT-6 Astra by 3.589.292.7+3.5
FactsGPT-6 Astra
- SimpleQA VerifiedGPT-6 Astra by 22.65375.6+22.6
- AA-Omniscience · AccuracyGPT-6 Astra by 13.848.862.6+13.8
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 1260.748.7+12
Images and chartsClaude Opus 4.8
- LMArena · VisionClaude Opus 4.8 by 13 rating points12941281+13 rating
MathGPT-6 Astra
- FrontierMath Tier 4GPT-6 Astra by 41.556.197.6+41.5
- FrontierMath Tiers 1-3 (v2)GPT-6 Astra by 13.78093.7+13.7
- LiveBench · MathematicsGPT-6 Astra by 2.594.396.8+2.5
Following instructionsGPT-6 Astra
- LiveBench · Instruction FollowingGPT-6 Astra by 3.67275.6+3.6
Other results16 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.
- RiemannBenchGPT-6 Astra by 383472+38
- Terminal-Bench 4.0GPT-6 Astra by 34.123.657.7+34.1
- Agents' Last ExamGPT-6 Astra by 33.625.759.3+33.6
- HiL-Bench (Tools-allowed)GPT-6 Astra by 3035.365.3+30
- livebench_data_analysisGPT-6 Astra by 176683+17
- OSWorld 2.0GPT-6 Astra by 16.955.772.6+16.9
- DeepSWE 1.1GPT-6 Astra by 15.15974.1+15.1
- AA-OmniscienceGPT-6 Astra by 14.628.843.4+14.6
- AA IntelligenceGPT-6 Astra by 10.941.852.7+10.9
- livebench_languageGPT-6 Astra by 9.779.789.4+9.7
- AA Agentic IndexGPT-6 Astra by 8.942.651.5+8.9
- HealthBench ProfessionalGPT-6 Astra by 7.655.863.4+7.6
- PostTrainBenchGPT-6 Astra by 7.137.244.3+7.1
- ARC-AGI-1GPT-6 Astra by 592.597.5+5
- ScreenSpot-Pro (No tools)GPT-6 Astra by 4.887.992.7+4.8
- Artificial Analysis Coding IndexGPT-6 Astra by 2.674.376.9+2.6
Questions people ask
Which is better, Claude Opus 4.8 or GPT-6 Astra?
GPT-6 Astra wins seven of the eight areas we test: coding, agents, reasoning, facts, math, long documents and following instructions. Claude Opus 4.8 wins images and charts, and costs 50% less.
Which is better for coding?
GPT-6 Astra. It wins 4 of the 5 coding tests both models report; Claude Opus 4.8 wins 1.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. That makes Claude Opus 4.8 about 50% cheaper for the same work.
How do you compare the two?
We use the 41 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 16 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.