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GPT-6 Astra vs Grok 4.3

GPT-6 Astra leads Grok 4.3 on coding, 85.1 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 20.0x less per output token ($2.50 vs $50.00 per million). Updated October 22, 2026; 83 benchmarks have a result for both.

Replace GPT-6 Astra Replace Grok 4.3
GPT-6 AstraOpenAI
Coding
85.1
Overall
83.0
Output $/M
$50.00
83
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
0
vs boards won of 83 shared

GPT-6 Astra or Grok 4.3: which to pick

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 20.0x cheaper ($2.50 vs $50.00 per million).

Model AGPT-6 AstraOpenAI85.1/1005 independent benchmarksNo cost per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
83
GPT-6 Astra only
38
Grok 4.3 only
22
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.

At a glance

Coding index
GPT-6 Astra 85.1 from 5 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Math, 42.7 points apart on average over 6 shared benchmarks.
Widest single gap
Vending-Bench 2: GPT-6 Astra $15,515 against Grok 4.3 $35, 96.7 points apart on a 0 to 100 scale.
Output price
GPT-6 Astra $50.00 against Grok 4.3 $2.50 per million output tokens, 20.0x apart.
Context window
GPT-6 Astra takes 1.05M tokens, Grok 4.3 1M.

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 4.3Ties
Coding140
Intelligence10
Agentic work120
Reasoning90
Math60
Knowledge60
Web design80
General270
All shared boards830
CodingLike-for-likeSix of these boards feed the Vibe Coding Index140
Coding benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
LiveBench coding93.7%Not measuredOnly GPT-6 Astra measured
LMArena WebDev17741358GPT-6 Astra
AA Coding Index76.942.2GPT-6 Astra
LiveCodeBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
SWE-bench Verified (Vals AI)Not measured71.4%Only Grok 4.3 measured
Terminal-Bench 4 (Vals AI)59.6%Not measuredOnly GPT-6 Astra measured
Vibe Code Bench (Vals AI)89.6%19.4%GPT-6 Astra
Code migration (Vals AI)67.7%6.8%GPT-6 Astra
ProgramBench (Vals AI)5.5%0.0%GPT-6 Astra
IOI (Vals AI)100.0%Not measuredOnly GPT-6 Astra measured
Terminal-Bench 2.1 (Vals AI)87.3%42.0%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%Not measuredOnly GPT-6 Astra measured
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
CyberBench (Vals AI)41.1%Not measuredOnly GPT-6 Astra measured
SciCode56.5%48.3%GPT-6 Astra
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
FrontierCode53.3%Not measuredOnly GPT-6 Astra measured
FrontierSWE65.5%Not measuredOnly GPT-6 Astra measured
GSO-Bench79.4%Not measuredOnly GPT-6 Astra measured
WeirdML93.3%49.9%GPT-6 Astra
MirrorCode46.7%Not measuredOnly GPT-6 Astra measured
ALE-Bench2951.3944.2GPT-6 Astra
LMArena Text: coding14891415GPT-6 Astra
LMArena Text: software and IT14741416GPT-6 Astra
LMArena WebDev: React17981353GPT-6 Astra
LMArena WebDev: HTML17751367GPT-6 Astra
LMArena WebDev: from an image17261375GPT-6 Astra
SciCode12.3%Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
AA Intelligence Index52.724.9GPT-6 Astra
Epoch Capabilities Index168.8Not measuredOnly GPT-6 Astra measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index120
Agentic work benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
AA Agentic Index51.015.5GPT-6 Astra
Design Arena: agents building web apps13731126GPT-6 Astra
Design Arena: agents building full-stack apps13571006GPT-6 Astra
Design Arena: agents building mobile apps13121058GPT-6 Astra
Design Arena: agents building Android appsNot measured962Only Grok 4.3 measured
Design Arena: agents building Godot games1348914GPT-6 Astra
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured959Only Grok 4.3 measured
Design Arena: PowerPoint slides1219988GPT-6 Astra
Design Arena: spreadsheets1365879GPT-6 Astra
LiveBench research85.2%Not measuredOnly GPT-6 Astra measured
LiveBench browser84.0%Not measuredOnly GPT-6 Astra measured
LiveBench long agentic82.4%Not measuredOnly GPT-6 Astra measured
SREBench (Vals AI)56.9%Not measuredOnly GPT-6 Astra measured
Finance Agent (Vals AI)53.5%37.7%GPT-6 Astra
Tax Agent Bench (Vals AI)20.7%6.2%GPT-6 Astra
Legal Research Bench (Vals AI)39.4%15.4%GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)7.1%Not measuredOnly GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)71.7%18.4%GPT-6 Astra
BioMysteryBench (Vals AI)79.3%Not measuredOnly GPT-6 Astra measured
Terminal-Bench-Science (Vals AI)62.9%Not measuredOnly GPT-6 Astra measured
Vals Science Index65.1%Not measuredOnly GPT-6 Astra measured
Time Horizon Index (Vals AI)90.5%Not measuredOnly GPT-6 Astra measured
CUA-bench (Vals AI)19.2%Not measuredOnly GPT-6 Astra measured
Robo-bench (Vals AI)23.3%Not measuredOnly GPT-6 Astra measured
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 measured
APEX-Agents64.7%Not measuredOnly GPT-6 Astra measured
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$35GPT-6 Astra
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
GPQA DiamondNot measured91.4%Only Grok 4.3 measured
LiveBench reasoning92.7%Not measuredOnly GPT-6 Astra measured
MysteryMechanism (Vals AI)53.1%Not measuredOnly GPT-6 Astra measured
MMMU Pro (Vals AI)Not measured83.1%Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)96.3%90.1%GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)54.7%37.2%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.8%88.8%GPT-6 Astra
ARC-AGI98.5%Not measuredOnly GPT-6 Astra measured
ARC-AGI-295.0%Not measuredOnly GPT-6 Astra measured
Chess puzzles74.0%18.0%GPT-6 Astra
Mystery game puzzles84.0%Not measuredOnly GPT-6 Astra measured
EBR-bench76.2%Not measuredOnly GPT-6 Astra measured
LMArena Text: hard prompts14631396GPT-6 Astra
LMArena Text: expert14891384GPT-6 Astra
LMArena Text: hard prompts in English14641402GPT-6 Astra
LMArena Vision: diagrams12971241GPT-6 Astra
LMArena Vision: homework13371241GPT-6 Astra
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
OTIS Mock AIME100.0%93.3%GPT-6 Astra
FrontierMath, tiers 1 to 393.7%42.8%GPT-6 Astra
FrontierMath, tier 497.6%14.6%GPT-6 Astra
ProofBench99.0%11.0%GPT-6 Astra
LMArena Text: math14651387GPT-6 Astra
LMArena Text: mathematical work14841396GPT-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 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
MMLU ProNot measured85.8%Only Grok 4.3 measured
LegalBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)Not measured68.5%Only Grok 4.3 measured
TaxEval (Vals AI)Not measured70.8%Only Grok 4.3 measured
MortgageTax (Vals AI)Not measured48.3%Only Grok 4.3 measured
MedCode (Vals AI)48.5%38.1%GPT-6 Astra
SimpleQA Verified75.6%33.2%GPT-6 Astra
LMArena Text: science14511399GPT-6 Astra
LMArena Text: medicine and healthcare14251384GPT-6 Astra
LMArena Text: legal and government14621386GPT-6 Astra
LMArena Text: business and finance14391381GPT-6 Astra
FACTS Benchmark Suite75.7%Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
Design Arena: websites13361196GPT-6 Astra
Design Arena: UI components13931190GPT-6 Astra
Design Arena: game dev14781173GPT-6 Astra
Design Arena: data viz13351179GPT-6 Astra
Design Arena: 3D15001124GPT-6 Astra
Design Arena: all code categories13791186GPT-6 Astra
Design Arena: SVG14311080GPT-6 Astra
Design Arena: ASCII art13531125GPT-6 Astra
LiveBench design82.0%Not measuredOnly GPT-6 Astra measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index270
General benchmarks for GPT-6 Astra and Grok 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
Vals Index65.0%Not measuredOnly GPT-6 Astra measured
LiveBench data analysis83.0%Not measuredOnly GPT-6 Astra measured
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)46.4%19.7%GPT-6 Astra
MedScribe (Vals AI)87.9%74.4%GPT-6 Astra
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)80.7%75.0%GPT-6 Astra
DTBench97.3%90.7%GPT-6 Astra
LMCA64.4%38.3%GPT-6 Astra
Furniture assembly80.0%Not measuredOnly GPT-6 Astra measured
LMArena Text14411397GPT-6 Astra
LMArena Text: instruction following14551366GPT-6 Astra
LMArena Text: creative writing14201380GPT-6 Astra
LMArena Vision12801229GPT-6 Astra
LMArena Text: English14471404GPT-6 Astra
LMArena Text: non-English14321385GPT-6 Astra
LMArena Text: Chinese14891422GPT-6 Astra
LMArena Text: German14591395GPT-6 Astra
LMArena Text: Japanese14051379GPT-6 Astra
LMArena Text: Korean14281354GPT-6 Astra
LMArena Text: French14321411GPT-6 Astra
LMArena Text: Spanish14221399GPT-6 Astra
LMArena Text: Russian14381399GPT-6 Astra
LMArena Text: Polish14221398GPT-6 Astra
LMArena Text: multi-turn14471406GPT-6 Astra
LMArena Text: longer queries14601393GPT-6 Astra
LMArena Text: writing and language14371385GPT-6 Astra
LMArena Text: entertainment and media14271370GPT-6 Astra
LMArena Vision: English12801235GPT-6 Astra
LMArena Vision: Chinese13611257GPT-6 Astra
LMArena Vision: reading text12921235GPT-6 Astra
LMArena Vision: humorNot measured1222Only Grok 4.3 measured
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writing12861237GPT-6 Astra
Neither model has a result on the other 11 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 4.3
BenchmarkGPT-6 AstraGrok 4.3Leader
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 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

GPT-6 Astra$0.650Fits in one request
Grok 4.3$0.070Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

GPT-6 Astra$2.50Fits in one request
Grok 4.3$0.275Fits in one request

Grok 4.3 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 4.3
SpecificationOpenAI GPT-6 AstraSpaceXAI Grok 4.3
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 4, 2026April 30, 2026
Context window1.05M1M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$2.50
Coding index85.137.4
Independent measurements behind it53
Cost per solved taskNot computable$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Astra better than Grok 4.3 for coding?

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 20.0x cheaper ($2.50 vs $50.00 per million).

Which is cheaper, GPT-6 Astra or Grok 4.3?

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Cost per solved task is known for Grok 4.3 only.

Which has the bigger context window, GPT-6 Astra or Grok 4.3?

GPT-6 Astra, with 1.05M tokens against 1M.

How many benchmarks is the GPT-6 Astra vs Grok 4.3 comparison based on?

83 benchmarks have a result for both models as of October 22, 2026. GPT-6 Astra's coding index rests on 5 independent benchmarks and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-astra-vs-grok-4-3">LLMBenchmark.ai, GPT-6 Astra vs Grok 4.3</a></p>