Gemini 3.1 Pro Preview vs GPT-6 Astra

GPT-6 Astra leads Gemini 3.1 Pro Preview on coding, 85.1 to 32.3 on the Vibe Coding Index, and Gemini 3.1 Pro Preview costs 4.2x less per output token ($12.00 vs $50.00 per million). Updated October 22, 2026; 101 benchmarks have a result for both.

Replace Gemini 3.1 Pro Preview Replace GPT-6 Astra

Gemini 3.1 Pro PreviewGoogle

Coding: 32.3
Overall: 54.0
Output $/M: $12.00

GPT-6 AstraOpenAI

Coding: 85.1
Overall: 83.0
Output $/M: $50.00

vs boards won of 101 shared

Gemini 3.1 Pro Preview or GPT-6 Astra: which to pick

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview.

Pick Gemini 3.1 Pro Preview for output tokens 4.2x cheaper ($12.00 vs $50.00 per million) and work measured by SciCode or LMArena Text: software and IT, where it leads.

Model AGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved task Model BGPT-6 AstraOpenAI85.1/1005 independent benchmarksNo cost per solved task

1013220

Shared results: 101
Gemini 3.1 Pro Preview only: 32
GPT-6 Astra only: 20
Like-for-like categories: 8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
GPT-6 Astra
GPT-6 Astra scores 85.1 against 32.3.
4 and 5 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 29.7.
Same board, both measured
Agentic work
AA Agentic Index
GPT-6 Astra
GPT-6 Astra leads, 51.0 against 8.2.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Pro Preview has a GPQA Diamond result, 95.5%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Pro Preview has a AIME result, 98.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Pro Preview has a MMLU Pro result, 91.0%.
Directional only
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1233.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Astra has a Vals Index result, 65.0%.
Directional only
Long documents
Listed context window
GPT-6 Astra
GPT-6 Astra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview $0.0080, GPT-6 Astra $0.035 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Pro Preview has the number, $0.99.
Directional only

At a glance

Coding index: Gemini 3.1 Pro Preview 32.3 from 4 benchmarks, GPT-6 Astra 85.1 from 5 benchmarks.
Widest category: Agentic work, 31.8 points apart on average over 17 shared benchmarks.
Widest single gap: Vending-Bench 2: Gemini 3.1 Pro Preview $911 against GPT-6 Astra $15,515, 91.3 points apart on a 0 to 100 scale.
Output price: Gemini 3.1 Pro Preview $12.00 against GPT-6 Astra $50.00 per million output tokens, 4.2x apart.
Context window: Gemini 3.1 Pro Preview takes 1.05M tokens, GPT-6 Astra 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Gemini 3.1 Pro Preview	GPT-6 Astra
Coding	3	17
Intelligence	0	1
Agentic work	0	17
Reasoning	3	11
Math	1	5
Knowledge	5	2
Web design	0	8
General	24	4
All shared boards	36	65

CodingLike-for-likeSix of these boards feed the Vibe Coding Index317

Coding benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
LiveBench coding	Not measured	93.7%	Only GPT-6 Astra measured
LMArena WebDev	1447	1774	GPT-6 Astra
AA Coding Index	68.8	76.9	GPT-6 Astra
LiveCodeBench (Vals AI)	88.5%	Not measured	Only Gemini 3.1 Pro Preview measured
SWE-bench Verified (Vals AI)	78.8%	Not measured	Only Gemini 3.1 Pro Preview measured
Terminal-Bench 4 (Vals AI)	2.5%	59.6%	GPT-6 Astra
Vibe Code Bench (Vals AI)	32.0%	89.6%	GPT-6 Astra
Code migration (Vals AI)	17.3%	67.7%	GPT-6 Astra
ProgramBench (Vals AI)	0.0%	5.5%	GPT-6 Astra
IOI (Vals AI)	51.8%	100.0%	GPT-6 Astra
Terminal-Bench 2.1 (Vals AI)	70.8%	87.3%	GPT-6 Astra
SWE-bench Multimodal (Vals AI)	Not measured	43.3%	Only GPT-6 Astra measured
Vibe Code Bench 1-100 (Vals AI)	6.7%	27.6%	GPT-6 Astra
CyberBench (Vals AI)	Not measured	41.1%	Only GPT-6 Astra measured
SciCode	58.7%	56.5%	Gemini 3.1 Pro Preview
Terminal-Bench Hard (Artificial Analysis run)	53.8%	Not measured	Only Gemini 3.1 Pro Preview measured
Terminal-Bench	80.2%	Not measured	Only Gemini 3.1 Pro Preview measured
FrontierCode	Not measured	53.3%	Only GPT-6 Astra measured
FrontierSWE	Not measured	65.5%	Only GPT-6 Astra measured
GSO-Bench	22.6%	79.4%	GPT-6 Astra
WeirdML	72.1%	93.3%	GPT-6 Astra
MirrorCode	8.9%	46.7%	GPT-6 Astra
ALE-Bench	1160.6	2951.3	GPT-6 Astra
LMArena Text: coding	1484	1489	GPT-6 Astra
LMArena Text: software and IT	1487	1474	Gemini 3.1 Pro Preview
LMArena WebDev: React	1438	1798	GPT-6 Astra
LMArena WebDev: HTML	1490	1775	GPT-6 Astra
LMArena WebDev: from an image	1481	1726	GPT-6 Astra
SciCode	14.3%	12.3%	Gemini 3.1 Pro Preview
Neither model has a result on the other 10 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01

Intelligence benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
AA Intelligence Index	29.7	52.7	GPT-6 Astra
Epoch Capabilities Index	Not measured	168.8	Only GPT-6 Astra measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index017

Agentic work benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
AA Agentic Index	8.2	51.0	GPT-6 Astra
Design Arena: agents building web apps	1125	1373	GPT-6 Astra
Design Arena: agents building full-stack apps	1068	1357	GPT-6 Astra
Design Arena: agents building mobile apps	1094	1312	GPT-6 Astra
Design Arena: agents building Android apps	1049	Not measured	Only Gemini 3.1 Pro Preview measured
Design Arena: agents building Godot games	1236	1348	GPT-6 Astra
Design Arena: agents building games	1113	Not measured	Only Gemini 3.1 Pro Preview measured
Design Arena: HTML slides	1103	Not measured	Only Gemini 3.1 Pro Preview measured
Design Arena: PowerPoint slides	1041	1219	GPT-6 Astra
Design Arena: spreadsheets	Not measured	1365	Only GPT-6 Astra measured
LiveBench research	Not measured	85.2%	Only GPT-6 Astra measured
LiveBench browser	Not measured	84.0%	Only GPT-6 Astra measured
LiveBench long agentic	Not measured	82.4%	Only GPT-6 Astra measured
SREBench (Vals AI)	0.0%	56.9%	GPT-6 Astra
Finance Agent (Vals AI)	43.0%	53.5%	GPT-6 Astra
Tax Agent Bench (Vals AI)	9.3%	20.7%	GPT-6 Astra
Legal Research Bench (Vals AI)	20.7%	39.4%	GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)	Not measured	7.1%	Only GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)	52.6%	71.7%	GPT-6 Astra
BioMysteryBench (Vals AI)	60.0%	79.3%	GPT-6 Astra
Terminal-Bench-Science (Vals AI)	1.4%	62.9%	GPT-6 Astra
Vals Science Index	27.4%	65.1%	GPT-6 Astra
Time Horizon Index (Vals AI)	Not measured	90.5%	Only GPT-6 Astra measured
CUA-bench (Vals AI)	Not measured	19.2%	Only GPT-6 Astra measured
Robo-bench (Vals AI)	Not measured	23.3%	Only GPT-6 Astra measured
τ²-Bench Telecom	95.6%	Not measured	Only Gemini 3.1 Pro Preview measured
APEX-Agents	35.1%	64.7%	GPT-6 Astra
METR time horizons	77.0%	Not measured	Only Gemini 3.1 Pro Preview measured
Remote Labor Index	Not measured	20.8%	Only GPT-6 Astra measured
BALROG	57.0%	68.3%	GPT-6 Astra
DeepResearch Bench	47.8%	Not measured	Only Gemini 3.1 Pro Preview measured
PostTrainBench	22.0%	Not measured	Only Gemini 3.1 Pro Preview measured
SpireClimb	Not measured	25.7%	Only GPT-6 Astra measured
Vending-Bench 2	$911	$15,515	GPT-6 Astra
Neither model has a result on the other 7 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index311

Reasoning benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
GPQA Diamond	95.5%	Not measured	Only Gemini 3.1 Pro Preview measured
LiveBench reasoning	Not measured	92.7%	Only GPT-6 Astra measured
MysteryMechanism (Vals AI)	20.7%	53.1%	GPT-6 Astra
MMMU Pro (Vals AI)	88.2%	Not measured	Only Gemini 3.1 Pro Preview measured
GPQA Diamond (Artificial Analysis run)	94.1%	96.3%	GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)	47.0%	54.7%	GPT-6 Astra
GPQA Diamond (Epoch AI run)	94.4%	95.8%	GPT-6 Astra
ARC-AGI	98.0%	98.5%	GPT-6 Astra
ARC-AGI-2	77.1%	95.0%	GPT-6 Astra
SimpleBench	79.6%	Not measured	Only Gemini 3.1 Pro Preview measured
Chess puzzles	51.0%	74.0%	GPT-6 Astra
Mystery game puzzles	34.0%	84.0%	GPT-6 Astra
EBR-bench	14.3%	76.2%	GPT-6 Astra
LMArena Text: hard prompts	1485	1463	Gemini 3.1 Pro Preview
LMArena Text: expert	1483	1489	GPT-6 Astra
LMArena Text: hard prompts in English	1480	1464	Gemini 3.1 Pro Preview
LMArena Vision: diagrams	1311	1297	Gemini 3.1 Pro Preview
LMArena Vision: homework	1316	1337	GPT-6 Astra
Neither model has a result on the other 4 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index15

Math benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
AIME	98.1%	Not measured	Only Gemini 3.1 Pro Preview measured
OTIS Mock AIME	95.6%	100.0%	GPT-6 Astra
FrontierMath, tiers 1 to 3	59.6%	93.7%	GPT-6 Astra
FrontierMath, tier 4	26.8%	97.6%	GPT-6 Astra
ProofBench	26.0%	99.0%	GPT-6 Astra
LMArena Text: math	1486	1465	Gemini 3.1 Pro Preview
LMArena Text: mathematical work	1478	1484	GPT-6 Astra
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index52

Knowledge benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
MMLU Pro	91.0%	Not measured	Only Gemini 3.1 Pro Preview measured
LegalBench (Vals AI)	87.4%	Not measured	Only Gemini 3.1 Pro Preview measured
CaseLaw (Vals AI)	64.8%	Not measured	Only Gemini 3.1 Pro Preview measured
CorpFin (Vals AI)	64.5%	Not measured	Only Gemini 3.1 Pro Preview measured
TaxEval (Vals AI)	72.9%	Not measured	Only Gemini 3.1 Pro Preview measured
MortgageTax (Vals AI)	69.4%	Not measured	Only Gemini 3.1 Pro Preview measured
MedQA (Vals AI)	96.4%	Not measured	Only Gemini 3.1 Pro Preview measured
MedCode (Vals AI)	59.1%	48.5%	Gemini 3.1 Pro Preview
SimpleQA Verified	73.5%	75.6%	GPT-6 Astra
LMArena Text: science	1497	1451	Gemini 3.1 Pro Preview
LMArena Text: medicine and healthcare	1486	1425	Gemini 3.1 Pro Preview
LMArena Text: legal and government	1487	1462	Gemini 3.1 Pro Preview
LMArena Text: business and finance	1459	1439	Gemini 3.1 Pro Preview
FACTS Benchmark Suite	67.4%	75.7%	GPT-6 Astra
Neither model has a result on the other 4 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index08

Web design benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
Design Arena: websites	1233	1336	GPT-6 Astra
Design Arena: UI components	1224	1393	GPT-6 Astra
Design Arena: game dev	1202	1478	GPT-6 Astra
Design Arena: data viz	1209	1335	GPT-6 Astra
Design Arena: 3D	1234	1500	GPT-6 Astra
Design Arena: all code categories	1231	1379	GPT-6 Astra
Design Arena: SVG	1285	1431	GPT-6 Astra
Design Arena: ASCII art	1270	1353	GPT-6 Astra
LiveBench design	Not measured	82.0%	Only GPT-6 Astra measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index244

General benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
Vals Index	Not measured	65.0%	Only GPT-6 Astra measured
LiveBench data analysis	Not measured	83.0%	Only GPT-6 Astra measured
Public Benefits Bench (Vals AI)	53.8%	Not measured	Only Gemini 3.1 Pro Preview measured
SAGE (Vals AI)	48.7%	46.4%	Gemini 3.1 Pro Preview
MedScribe (Vals AI)	76.1%	87.9%	GPT-6 Astra
Vals Multimodal Index	56.1%	Not measured	Only Gemini 3.1 Pro Preview measured
IFBench	77.1%	Not measured	Only Gemini 3.1 Pro Preview measured
Long context reasoning (AA-LCR)	82.0%	80.7%	Gemini 3.1 Pro Preview
DTBench	97.1%	97.3%	GPT-6 Astra
LMCA	53.8%	64.4%	GPT-6 Astra
CL-bench	20.8%	Not measured	Only Gemini 3.1 Pro Preview measured
Furniture assembly	26.7%	80.0%	GPT-6 Astra
ExploitBench	26.1%	Not measured	Only Gemini 3.1 Pro Preview measured
CL-bench Life	16.9%	Not measured	Only Gemini 3.1 Pro Preview measured
LMArena Text	1480	1441	Gemini 3.1 Pro Preview
LMArena Text: instruction following	1466	1455	Gemini 3.1 Pro Preview
LMArena Text: creative writing	1482	1420	Gemini 3.1 Pro Preview
LMArena Vision	1296	1280	Gemini 3.1 Pro Preview
LMArena Text: English	1478	1447	Gemini 3.1 Pro Preview
LMArena Text: non-English	1476	1432	Gemini 3.1 Pro Preview
LMArena Text: Chinese	1527	1489	Gemini 3.1 Pro Preview
LMArena Text: German	1490	1459	Gemini 3.1 Pro Preview
LMArena Text: Japanese	1491	1405	Gemini 3.1 Pro Preview
LMArena Text: Korean	1455	1428	Gemini 3.1 Pro Preview
LMArena Text: French	1487	1432	Gemini 3.1 Pro Preview
LMArena Text: Spanish	1481	1422	Gemini 3.1 Pro Preview
LMArena Text: Russian	1497	1438	Gemini 3.1 Pro Preview
LMArena Text: Polish	1498	1422	Gemini 3.1 Pro Preview
LMArena Text: multi-turn	1487	1447	Gemini 3.1 Pro Preview
LMArena Text: longer queries	1482	1460	Gemini 3.1 Pro Preview
LMArena Text: writing and language	1481	1437	Gemini 3.1 Pro Preview
LMArena Text: entertainment and media	1465	1427	Gemini 3.1 Pro Preview
LMArena Vision: English	1287	1280	Gemini 3.1 Pro Preview
LMArena Vision: Chinese	1364	1361	Gemini 3.1 Pro Preview
LMArena Vision: reading text	1304	1292	Gemini 3.1 Pro Preview
LMArena Vision: humor	1322	Not measured	Only Gemini 3.1 Pro Preview measured
LMArena Vision: captioning	1345	Not measured	Only Gemini 3.1 Pro Preview measured
LMArena Vision: recognizing things	1330	Not measured	Only Gemini 3.1 Pro Preview measured
LMArena Vision: creative writing	1324	1286	Gemini 3.1 Pro Preview
LMArena Document	1444	Not measured	Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 6 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Gemini 3.1 Pro Preview and GPT-6 Astra
Benchmark	Gemini 3.1 Pro Preview	GPT-6 Astra	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3.1 Pro Preview$0.0080Fits in one request

GPT-6 Astra$0.035Fits in one request

Gemini 3.1 Pro Preview costs less

Repository review

50K input + 3K output tokens

Gemini 3.1 Pro Preview$0.136Fits in one request

GPT-6 Astra$0.650Fits in one request

Gemini 3.1 Pro Preview costs less

Agent loop

200K input + 10K output tokens

Gemini 3.1 Pro Preview$0.520Fits in one request

GPT-6 Astra$2.50Fits in one request

Gemini 3.1 Pro Preview costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3.1 Pro Preview and GPT-6 Astra
Specification	Google Gemini 3.1 Pro Preview	OpenAI GPT-6 Astra
Maker	Google	OpenAI
Weights	No public weights listed	No public weights listed
Released	February 19, 2026	September 4, 2026
Context window	1.05M	1.05M
Input $/Mtok	$2.00	$10.00
Output $/Mtok	$12.00	$50.00
Coding index	32.3	85.1
Independent measurements behind it	4	5
Cost per solved task	$0.99	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Gemini 3.1 Pro Preview better than GPT-6 Astra for coding?

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview. Pick Gemini 3.1 Pro Preview for output tokens 4.2x cheaper ($12.00 vs $50.00 per million) and work measured by SciCode or LMArena Text: software and IT, where it leads.

Which is cheaper, Gemini 3.1 Pro Preview or GPT-6 Astra?

Gemini 3.1 Pro Preview costs $2.00 per million input tokens and $12.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for Gemini 3.1 Pro Preview only.

Which has the bigger context window, Gemini 3.1 Pro Preview or GPT-6 Astra?

GPT-6 Astra, with 1.05M tokens against 1.05M.

How many benchmarks is the Gemini 3.1 Pro Preview vs GPT-6 Astra comparison based on?

101 benchmarks have a result for both models as of October 22, 2026. Gemini 3.1 Pro Preview's coding index rests on 4 independent benchmarks and GPT-6 Astra's on 5. Where only one model has a result, the page says so instead of naming a winner.

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Gemini 3.1 Pro Preview or GPT-6 Astra: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

General

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next