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GPT-6 Astra vs Grok 4.6

Updated October 21, 2026. 107 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-6 Astra Replace Grok 4.6
GPT-6 AstraOpenAI
Coding
88.7
Overall
52.7
Output $/M
$50.00
95
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
10
vs boards won of 107 shared, 2 tied

Decision reading

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 76.4 for Grok 4.6.

Pick Grok 4.6 when output tokens cost 8.3x less, or when what matters is CyberBench (Vals AI) or AA Agentic Index, where it leads.

Model AGPT-6 AstraOpenAI88.7/1002 independent benchmarksNo cost per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
107
GPT-6 Astra only
12
Grok 4.6 only
16
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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.

At a glance

Coding index
GPT-6 Astra 88.7 from 2 benchmarks, Grok 4.6 76.4 from 2 benchmarks.
Widest category
Math, 25.6 points apart on average over 6 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): GPT-6 Astra 90.5% against Grok 4.6 5.8%, 84.7 points apart on a 0 to 100 scale.
Output price
GPT-6 Astra $50.00 against Grok 4.6 $6.00 per million output tokens, 8.3x apart.
Context window
GPT-6 Astra takes 1.05M tokens, Grok 4.6 500K.

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
CategoryGPT-6 AstraBarsGrok 4.6Ties
Coding1911 tie
Intelligence20
Agentic work145
Reasoning150
Math60
Knowledge60
Web design90
General2441 tie
All shared boards95102 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index191
Coding benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
LiveBench coding93.7%89.1%GPT-6 Astra
LMArena WebDev17741617GPT-6 Astra
AA Coding Index76.976.8GPT-6 Astra
LiveCodeBench (Vals AI)Not measured88.2%Only Grok 4.6 measured
SWE-bench Verified (Vals AI)Not measured95.6%Only Grok 4.6 measured
Terminal-Bench 4 (Vals AI)59.6%17.2%GPT-6 Astra
Vibe Code Bench (Vals AI)89.6%76.2%GPT-6 Astra
Code migration (Vals AI)67.7%44.6%GPT-6 Astra
ProgramBench (Vals AI)5.5%1.0%GPT-6 Astra
IOI (Vals AI)100.0%47.6%GPT-6 Astra
Terminal-Bench 2.1 (Vals AI)87.3%78.3%GPT-6 Astra
SWE-bench Multimodal (Vals AI)43.3%Not measuredOnly GPT-6 Astra measured
Vibe Code Bench 1-100 (Vals AI)27.6%14.8%GPT-6 Astra
SkillsBench (Vals AI)Not measured55.8%Only Grok 4.6 measured
CyberBench (Vals AI)41.1%67.7%Grok 4.6
SciCode56.5%56.5%Tie
FrontierCode53.3%48.0%GPT-6 Astra
FrontierSWE65.5%25.3%GPT-6 Astra
GSO-Bench79.4%Not measuredOnly GPT-6 Astra measured
WeirdML93.3%67.3%GPT-6 Astra
MirrorCode46.7%Not measuredOnly GPT-6 Astra measured
ALE-Bench2951.31508.1GPT-6 Astra
LMArena Text: coding14891466GPT-6 Astra
LMArena Text: software and IT14741457GPT-6 Astra
LMArena WebDev: React17981631GPT-6 Astra
LMArena WebDev: HTML17751597GPT-6 Astra
LMArena WebDev: from an image17261603GPT-6 Astra
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
AA Intelligence Index52.744.3GPT-6 Astra
Epoch Capabilities Index168.8156.6GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index145
Agentic work benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
AA Agentic Index51.053.0Grok 4.6
Design Arena: agents building web apps13721247GPT-6 Astra
Design Arena: agents building full-stack apps13571264GPT-6 Astra
Design Arena: agents building mobile apps13121234GPT-6 Astra
Design Arena: agents building Android appsNot measured1297Only Grok 4.6 measured
Design Arena: agents building Godot games13481276GPT-6 Astra
Design Arena: agents building gamesNot measured1208Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1249Only Grok 4.6 measured
Design Arena: PowerPoint slides12451241GPT-6 Astra
Design Arena: spreadsheets1380Not measuredOnly GPT-6 Astra measured
LiveBench research85.2%84.5%GPT-6 Astra
LiveBench browser84.0%64.0%GPT-6 Astra
LiveBench long agentic82.4%40.7%GPT-6 Astra
SREBench (Vals AI)56.9%Not measuredOnly GPT-6 Astra measured
Finance Agent (Vals AI)53.5%53.7%Grok 4.6
Tax Agent Bench (Vals AI)20.7%33.1%Grok 4.6
Legal Research Bench (Vals AI)39.4%48.1%Grok 4.6
Harvey's Legal Agent Benchmark (Vals AI)7.1%Not measuredOnly GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)71.7%62.7%GPT-6 Astra
BioMysteryBench (Vals AI)79.3%72.2%GPT-6 Astra
Terminal-Bench-Science (Vals AI)62.9%11.4%GPT-6 Astra
Vals Science Index65.1%38.1%GPT-6 Astra
Time Horizon Index (Vals AI)90.5%5.8%GPT-6 Astra
CUA-bench (Vals AI)19.2%Not measuredOnly GPT-6 Astra measured
Robo-bench (Vals AI)23.3%Not measuredOnly GPT-6 Astra measured
APEX-Agents64.7%65.3%Grok 4.6
Remote Labor Index20.8%Not measuredOnly GPT-6 Astra measured
BALROG68.3%Not measuredOnly GPT-6 Astra measured
SpireClimb25.7%Not measuredOnly GPT-6 Astra measured
Vending-Bench 2$15,515$9,047GPT-6 Astra
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index150
Reasoning benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
GPQA DiamondNot measured94.7%Only Grok 4.6 measured
LiveBench reasoning92.7%91.2%GPT-6 Astra
MysteryMechanism (Vals AI)53.1%30.6%GPT-6 Astra
GPQA Diamond (Artificial Analysis run)96.3%94.9%GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)54.7%44.1%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.8%94.0%GPT-6 Astra
ARC-AGI98.5%87.5%GPT-6 Astra
ARC-AGI-295.0%67.1%GPT-6 Astra
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles74.0%33.0%GPT-6 Astra
Mystery game puzzles84.0%34.0%GPT-6 Astra
EBR-bench76.2%30.5%GPT-6 Astra
LMArena Text: hard prompts14631448GPT-6 Astra
LMArena Text: expert14891469GPT-6 Astra
LMArena Text: hard prompts in English14641445GPT-6 Astra
LMArena Vision: diagrams12971285GPT-6 Astra
LMArena Vision: homework13371283GPT-6 Astra
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
OTIS Mock AIME100.0%99.2%GPT-6 Astra
FrontierMath, tiers 1 to 393.7%66.0%GPT-6 Astra
FrontierMath, tier 497.6%31.7%GPT-6 Astra
ProofBench99.0%51.0%GPT-6 Astra
LMArena Text: math14651417GPT-6 Astra
LMArena Text: mathematical work14841464GPT-6 Astra
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
MMLU ProNot measured89.4%Only Grok 4.6 measured
LegalBench (Vals AI)Not measured86.3%Only Grok 4.6 measured
CorpFin (Vals AI)Not measured66.2%Only Grok 4.6 measured
TaxEval (Vals AI)Not measured71.1%Only Grok 4.6 measured
MortgageTax (Vals AI)Not measured64.2%Only Grok 4.6 measured
MedCode (Vals AI)48.5%44.7%GPT-6 Astra
SimpleQA Verified75.6%49.3%GPT-6 Astra
LMArena Text: science14511437GPT-6 Astra
LMArena Text: medicine and healthcare14251420GPT-6 Astra
LMArena Text: legal and government14621429GPT-6 Astra
LMArena Text: business and finance14391416GPT-6 Astra
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
Design Arena: websites13371289GPT-6 Astra
Design Arena: UI components13941294GPT-6 Astra
Design Arena: game dev14741296GPT-6 Astra
Design Arena: data viz13351283GPT-6 Astra
Design Arena: 3D15011277GPT-6 Astra
Design Arena: all code categories13791292GPT-6 Astra
Design Arena: SVG14311239GPT-6 Astra
Design Arena: ASCII art13591278GPT-6 Astra
LiveBench design82.0%79.8%GPT-6 Astra
GeneralLike-for-likePublic boards, shown as published, kept out of the index244
General benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
Vals Index65.0%Not measuredOnly GPT-6 Astra measured
LiveBench data analysis83.0%75.3%GPT-6 Astra
Public Benefits Bench (Vals AI)Not measured66.8%Only Grok 4.6 measured
SAGE (Vals AI)46.4%28.9%GPT-6 Astra
MedScribe (Vals AI)87.9%86.5%GPT-6 Astra
Long context reasoning (AA-LCR)80.7%81.0%Grok 4.6
DTBench97.3%97.3%Tie
LMCA64.4%48.5%GPT-6 Astra
Furniture assembly80.0%40.0%GPT-6 Astra
LMArena Text14411429GPT-6 Astra
LMArena Text: instruction following14551431GPT-6 Astra
LMArena Text: creative writing14201426Grok 4.6
LMArena Vision12801263GPT-6 Astra
LMArena Text: English14471433GPT-6 Astra
LMArena Text: non-English14321420GPT-6 Astra
LMArena Text: Chinese14891476GPT-6 Astra
LMArena Text: German14591426GPT-6 Astra
LMArena Text: Japanese14051378GPT-6 Astra
LMArena Text: Korean14281391GPT-6 Astra
LMArena Text: French14321455Grok 4.6
LMArena Text: Spanish14221414GPT-6 Astra
LMArena Text: Russian14381421GPT-6 Astra
LMArena Text: Polish14221430Grok 4.6
LMArena Text: multi-turn14471425GPT-6 Astra
LMArena Text: longer queries14601456GPT-6 Astra
LMArena Text: writing and language14371429GPT-6 Astra
LMArena Text: entertainment and media14271421GPT-6 Astra
LMArena Vision: English12801270GPT-6 Astra
LMArena Vision: Chinese13611289GPT-6 Astra
LMArena Vision: reading text12921272GPT-6 Astra
LMArena Vision: humorNot measured1270Only Grok 4.6 measured
LMArena Vision: creative writing12861262GPT-6 Astra
LMArena DocumentNot measured1452Only Grok 4.6 measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6 Astra and Grok 4.6
BenchmarkGPT-6 AstraGrok 4.6Leader
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

GPT-6 Astra$0.035Fits in one request
Grok 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

GPT-6 Astra$0.650Fits in one request
Grok 4.6$0.118Fits in one request

Grok 4.6 costs less

Agent loop

200K input + 10K output tokens

GPT-6 Astra$2.50Fits in one request
Grok 4.6$0.460Fits in one request

Grok 4.6 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 GPT-6 Astra and Grok 4.6
SpecificationOpenAI GPT-6 AstraSpaceXAI Grok 4.6
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 4, 2026August 12, 2026
Context window1.05M500K
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index88.776.4
Independent measurements behind it22
Cost per solved taskNot computable$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Astra better than Grok 4.6 for coding?

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 76.4 for Grok 4.6. Pick Grok 4.6 when output tokens cost 8.3x less, or when what matters is CyberBench (Vals AI) or AA Agentic Index, where it leads.

Which is cheaper, GPT-6 Astra or Grok 4.6?

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.6 only.

Which has the bigger context window, GPT-6 Astra or Grok 4.6?

GPT-6 Astra, with 1.05M tokens against 500K.

How many benchmarks is the GPT-6 Astra vs Grok 4.6 comparison based on?

107 benchmarks have a result for both models as of October 21, 2026. GPT-6 Astra's coding index rests on 2 independent benchmarks and Grok 4.6's on 2. Where only one model has a result, the page says so instead of naming a winner.

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