GPT-5.1 vs GPT-6 Astra
Wins 0 of 6 areas
—
Wins 5 of 6 areas
Coding · Agents · Reasoning · Facts · Images and charts
GPT-6 Astra is the stronger all-rounder.GPT-5.1 is cheaper.
Scores updated · 31 tests both models report · How we compare
Where each one wins
Tests won in each of the six areas where both have results. 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 thinking05GPT-6 Astra5 of 5 tests
- FactsGetting facts right instead of making them up03GPT-6 Astra3 of 4 tests · 1 tie
- CodingWriting and fixing software03GPT-6 Astra3 of 3 tests
- AgentsCarrying out multi-step tasks on its own03GPT-6 Astra3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video02GPT-6 Astra2 of 2 tests
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Long documents rests on a single test.
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-5.1 costs 81% 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
- Abstract visual puzzles that people can solveARC-AGI-2+77.4points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+40.7points ahead
- Real work tasks from 44 professionsGDPVal+37.3points ahead
Where GPT-5.1 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 31 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 379 rating points13961775+379 rating
- Terminal-Bench 2.1GPT-6 Astra by 3652.488.4+36
- SciCodeGPT-6 Astra by 13.243.356.5+13.2
AgentsGPT-6 Astra
- BrowseCompGPT-6 Astra by 40.750.891.5+40.7
- GDPValGPT-6 Astra by 37.316.353.6+37.3
- τ-Bench V3 · BankingGPT-6 Astra by 25.515.941.4+25.5
ReasoningGPT-6 Astra
- ARC-AGI-2GPT-6 Astra by 77.417.695+77.4
- SimpleBenchGPT-6 Astra by 30.453.283.6+30.4
- CritPtGPT-6 Astra by 26.84.931.7+26.8
- Humanity's Last ExamGPT-6 Astra by 26.228.554.7+26.2
- GPQA DiamondGPT-6 Astra by 8.887.396.1+8.8
FactsGPT-6 Astra
- SimpleQA VerifiedGPT-6 Astra by 27.64875.6+27.6
- AA-Omniscience · AccuracyGPT-6 Astra by 24.937.762.6+24.9
- Vectara HHEM hallucination ratelower is betterGPT-6 Astra by 3.412.18.7+3.4
- AA-Omniscience · Non-hallucinationtie48.148.7tie
Images and chartsGPT-6 Astra
- MMMU-ProGPT-6 Astra by 11.475.586.9+11.4
- LMArena · VisionGPT-6 Astra by 30 rating points12501280+30 rating
Other results13 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.
- AA-OmniscienceGPT-6 Astra by 385.443.4+38
- AA Agentic IndexGPT-6 Astra by 29.921.651.5+29.9
- AA IntelligenceGPT-6 Astra by 2824.752.7+28
- Artificial Analysis Coding IndexGPT-6 Astra by 27.549.476.9+27.5
- HealthBench Professional length-adjustedGPT-6 Astra by 25.139.664.7+25.1
- ARC-AGI-1GPT-6 Astra by 24.772.897.5+24.7
- HLE (with tools)GPT-6 Astra by 14.542.757.2+14.5
- HealthBench Hard length-adjustedGPT-6 Astra by 11.225.436.6+11.2
- vectara_avg_summary_lengthGPT-5.1 by 105.9 rating points254.4148.5+105.9 rating
- HealthBench length-adjustedGPT-6 Astra by 7.450.958.3+7.4
- vectara_factual_consistencyGPT-6 Astra by 3.487.991.3+3.4
- HealthBench Consensus length-adjustedtie9595.5tie
- vectara_answer_ratetie100100tie
Questions people ask
Which is better, GPT-5.1 or GPT-6 Astra?
GPT-6 Astra wins five of the six areas where both have results: coding, agents, reasoning, facts and images and charts. GPT-5.1 wins none, but costs 81% less. They are level on long documents.
Which is better for coding?
GPT-6 Astra. It wins 3 of the 3 coding tests both models report; GPT-5.1 wins none.
Which is cheaper?
GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. That makes GPT-5.1 about 81% cheaper for the same work.
How do you compare the two?
We use the 31 benchmark tests both models have published scores on. The verdict counts the 18 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 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.