Gemini 3.5 Flash vs GPT-6 Astra
Wins 0 of 8 areas
—
Wins 6 of 8 areas
Coding · Agents · Reasoning · Facts · Math · Long documents
GPT-6 Astra is the stronger all-rounder.Gemini 3.5 Flash is cheaper.
Scores updated · 35 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 thinking06GPT-6 Astra6 of 6 tests
- CodingWriting and fixing software05GPT-6 Astra5 of 5 tests
- AgentsCarrying out multi-step tasks on its own04GPT-6 Astra4 of 4 tests
- FactsGetting facts right instead of making them up03GPT-6 Astra3 of 3 tests
- MathCompetition and research-level math03GPT-6 Astra3 of 3 tests
- Long documentsFinding answers in very long texts01GPT-6 Astra1 of 1 test
- Images and chartsUnderstanding pictures, charts and video11Even1 each
- Following instructionsDoing exactly what it is asked00Even0 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.
Gemini 3.5 Flash costs 83% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+70.8points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+52.5points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+30.9points ahead
Where Gemini 3.5 Flash pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 35 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 276 rating points14991775+276 rating
- Terminal-Bench 2.1GPT-6 Astra by 9.778.788.4+9.7
- LiveBench · Agentic CodingGPT-6 Astra by 8.34957.3+8.3
- SciCodeGPT-6 Astra by 2.653.956.5+2.6
- LiveBench · CodingGPT-6 Astra by 2.278.280.4+2.2
AgentsGPT-6 Astra
- Terminal-Bench 4.0GPT-6 Astra by 52.56.659.1+52.5
- GDPValGPT-6 Astra by 18.535.153.6+18.5
- τ-Bench V3 · BankingGPT-6 Astra by 9.232.241.4+9.2
- AA IT-Bench SREGPT-6 Astra by 8.340.348.6+8.3
ReasoningGPT-6 Astra
- ARC-AGI-2GPT-6 Astra by 22.972.195+22.9
- CritPtGPT-6 Astra by 18.613.131.7+18.6
- Humanity's Last ExamGPT-6 Astra by 1242.754.7+12
- LiveBench · ReasoningGPT-6 Astra by 10.78292.7+10.7
- SimpleBenchGPT-6 Astra by 6.976.783.6+6.9
- GPQA DiamondGPT-6 Astra by 3.992.296.1+3.9
FactsGPT-6 Astra
- AA-Omniscience · AccuracyGPT-6 Astra by 11.251.462.6+11.2
- AA-Omniscience · Non-hallucinationGPT-6 Astra by 10.937.848.7+10.9
- SimpleQA VerifiedGPT-6 Astra by 9.466.275.6+9.4
Images and chartsEven
- LMArena · VisionGemini 3.5 Flash by 28 rating points13081280+28 rating
- MMMU-ProGPT-6 Astra by 2.684.386.9+2.6
MathGPT-6 Astra
- FrontierMath Tier 4GPT-6 Astra by 70.826.897.6+70.8
- FrontierMath Tiers 1-3 (v2)GPT-6 Astra by 30.962.893.7+30.9
- LiveBench · MathematicsGPT-6 Astra by 8.688.296.8+8.6
Following instructionsEven
- LiveBench · Instruction Followingtie75.675.6tie
Other results10 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.
- HiL-Bench (Tools-allowed)GPT-6 Astra by 37.627.765.3+37.6
- DeepSWE 1.1GPT-6 Astra by 37.13774.1+37.1
- AA Agentic IndexGPT-6 Astra by 24.227.351.5+24.2
- AA-OmniscienceGPT-6 Astra by 22.221.243.4+22.2
- AA IntelligenceGPT-6 Astra by 20.132.652.7+20.1
- livebench_data_analysisGPT-6 Astra by 18.164.983+18.1
- LVBenchGPT-6 Astra by 11.276.387.5+11.2
- Artificial Analysis Coding IndexGPT-6 Astra by 6.870.176.9+6.8
- ARC-AGI-1GPT-6 Astra by 592.597.5+5
- livebench_languageGPT-6 Astra by 4.884.689.4+4.8
Questions people ask
Which is better, Gemini 3.5 Flash or GPT-6 Astra?
GPT-6 Astra wins six of the eight areas we test: coding, agents, reasoning, facts, math and long documents. Gemini 3.5 Flash wins none, but costs 83% less. They are level on images and charts and following instructions.
Which is better for coding?
GPT-6 Astra. It wins 5 of the 5 coding tests both models report; Gemini 3.5 Flash wins none.
Which is cheaper?
Gemini 3.5 Flash costs $1.50 per million input tokens and $9.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. That makes Gemini 3.5 Flash about 83% cheaper for the same work.
How do you compare the two?
We use the 35 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 10 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.