GPT-5.1-Codex-Max vs Grok Build 0.1
Grok Build 0.1 costs 5.0x less per output token than GPT-5.1-Codex-Max ($2.00 vs $10.00 per million). Updated October 21, 2026; 1 benchmarks have a result for both.
GPT-5.1-Codex-Max or Grok Build 0.1: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick GPT-5.1-Codex-Max for a larger context window (400K against 256K tokens).
- Shared results
- 1
- GPT-5.1-Codex-Max only
- 5
- Grok Build 0.1 only
- 2
- Like-for-like categories
- 1 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
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Grok Build 0.1 has a AA Intelligence Index result, 27.2.
Directional only
Long documents
Listed context window
GPT-5.1-Codex-Max
GPT-5.1-Codex-Max takes 400K tokens against 256K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Grok Build 0.1
GPT-5.1-Codex-Max $0.0063, Grok Build 0.1 $0.0020 per turn.
List prices
At a glance
- Coding index
- GPT-5.1-Codex-Max not benchmarked, Grok Build 0.1 not benchmarked.
- Widest category
- Coding, 8.8 points apart on average over 1 shared benchmark.
- Widest single gap
- Vibe Code Bench (Vals AI): GPT-5.1-Codex-Max 22.2% against Grok Build 0.1 13.4%, 8.8 points apart on a 0 to 100 scale.
- Output price
- GPT-5.1-Codex-Max $10.00 against Grok Build 0.1 $2.00 per million output tokens, 5.0x apart.
- Context window
- GPT-5.1-Codex-Max takes 400K tokens, Grok Build 0.1 256K.
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.
| Category | GPT-5.1-Codex-Max | Bars | Grok Build 0.1 | Ties |
|---|---|---|---|---|
| Coding | 1 | 0 | ||
| All shared boards | 1 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index10
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| AA Coding Index | Not measured | 51.5 | Only Grok Build 0.1 measured |
| LiveCodeBench (Vals AI) | 83.6% | Not measured | Only GPT-5.1-Codex-Max measured |
| Vibe Code Bench (Vals AI) | 22.2% | 13.4% | GPT-5.1-Codex-Max |
| Terminal-Bench | 60.4% | Not measured | Only GPT-5.1-Codex-Max measured |
| ALE-Bench | 1228.3 | Not measured | Only GPT-5.1-Codex-Max measured |
| Neither model has a result on the other 34 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 27.2 | Only Grok Build 0.1 measured |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| METR time horizons | 70.8% | Not measured | Only GPT-5.1-Codex-Max measured |
| Neither model has a result on the other 40 boards here | |||
ReasoningNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| Neither model has a result on 22 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| ProofBench | 9.0% | Not measured | Only GPT-5.1-Codex-Max measured |
| Neither model has a result on the other 12 boards here | |||
KnowledgeNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| Neither model has a result on 18 boards here | |||
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| Neither model has a result on 9 boards here | |||
GeneralNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | Leader |
|---|---|---|---|
| Neither model has a result on 46 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.1-Codex-Max | Grok Build 0.1 | 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
Grok Build 0.1 costs less
Repository review
50K input + 3K output tokens
Grok Build 0.1 costs less
Agent loop
200K input + 10K output tokens
Grok Build 0.1 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.
| Specification | OpenAI GPT-5.1-Codex-Max | SpaceXAI Grok Build 0.1 |
|---|---|---|
| Maker | OpenAI | xAI |
| Weights | No public weights listed | No public weights listed |
| Released | December 4, 2025 | May 20, 2026 |
| Context window | 400K | 256K |
| Input $/Mtok | $1.25 | $1.00 |
| Output $/Mtok | $10.00 | $2.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 1 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-5.1-Codex-Max better than Grok Build 0.1 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5.1-Codex-Max for a larger context window (400K against 256K tokens).
Which is cheaper, GPT-5.1-Codex-Max or Grok Build 0.1?
GPT-5.1-Codex-Max costs $1.25 per million input tokens and $10.00 per million output tokens; Grok Build 0.1 costs $1.00 and $2.00. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-5.1-Codex-Max or Grok Build 0.1?
GPT-5.1-Codex-Max, with 400K tokens against 256K.
How many benchmarks is the GPT-5.1-Codex-Max vs Grok Build 0.1 comparison based on?
1 benchmarks have a result for both models as of October 21, 2026. GPT-5.1-Codex-Max's coding index rests on 1 independent benchmark and Grok Build 0.1's on 1. Where only one model has a result, the page says so instead of naming a winner.