Model comparison
GPT-5.1-Codex vs Grok 4.6
Grok 4.6 is the stronger model overall, scoring 56.9 to 38.6 on the Noometry Index.
Last verified . 3 shared benchmarks.
Summary
- They share 3 benchmarks with published results for both. GPT-5.1-Codex scores higher in 0 categories and Grok 4.6 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.6 leads 67.0 to 30.3.
- The biggest single-benchmark swing is ProofBench: 9% for GPT-5.1-Codex and 51% for Grok 4.6.
- Grok 4.6 is cheaper at $2 / $6 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- Grok 4.6 accepts more context: 500K tokens versus 400K.
Side by side
| GPT-5.1-Codex | Grok 4.6 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 38.6 | 56.9 |
| Released | 2025-11-12 | 2026-08-12 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 500K |
| Max output | 128K | 500K |
| Input $ / M tokens | $1.25 | $2 |
| Output $ / M tokens | $10 | $6 |
| Results tracked | 6 | 49 |
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Category by category
Coding Grok 4.6 leads
GPT-5.1-Codex: 41.9 (#116), Grok 4.6: 58.5 (#16)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena WebDev | 1337 | 1617 |
| ALE-Bench | 1,245 | 1,508 |
| DeepSWE | — | 67.5% |
| FrontierCode | — | 48% |
| SWE-bench Verified (bash only) | 66% | — |
| CursorBench | — | 41.4% |
| FrontierSWE | — | 25.3% |
| SciCode | — | 56.5% |
| WeirdML | — | 67.3% |
| LMArena Coding | — | 1465 |
Agentic & Tool Use Grok 4.6 leads
GPT-5.1-Codex: 38.0 (#33), Grok 4.6: 39.4 (#27)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| APEX-Agents | — | 65.3% |
| GDP.pdf | — | 17.2% |
| METR Time Horizons | 70.8% | — |
| Vending-Bench 2 | — | 9,047 |
Reasoning Not comparable
GPT-5.1-Codex: —, Grok 4.6: 61.4 (#20)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| ARC-AGI-2 | — | 67.1% |
| SimpleBench | — | 75.9% |
| NYT Connections (extended) | — | 80% |
| ARC-AGI-1 | — | 87.5% |
| CritPt | — | 19.7% |
| Chess Puzzles | — | 40% |
| EBR-Bench | — | 30.5% |
| LMArena Hard Prompts | — | 1447 |
| Mystery Game Puzzles | — | 34% |
| DTBench | — | 97.3% |
| LMCA | — | 48.5% |
| Epoch Capabilities Index | — | 156.44 |
Math Grok 4.6 leads
GPT-5.1-Codex: 30.3 (#235), Grok 4.6: 67.0 (#24)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| ProofBench | 9% | 51% |
| FrontierMath (Tiers 1-3) | — | 66% |
| FrontierMath Tier 4 | — | 31.7% |
| OTIS Mock AIME 2024-2025 | — | 99.2% |
| LMArena Math | — | 1423 |
Knowledge Not comparable
GPT-5.1-Codex: —, Grok 4.6: 63.3 (#20)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| GPQA Diamond | — | 94% |
| SimpleQA Verified | — | 49.3% |
| LMArena Expert | — | 1467 |
Multimodal Not comparable
GPT-5.1-Codex: —, Grok 4.6: 43.6 (#23)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 33.2% |
| Furniture Assembly | — | 40% |
| LMArena Document | — | 1452 |
Multilingual Not comparable
GPT-5.1-Codex: —, Grok 4.6: 53.0 (#74)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena Non-English | — | 1420 |
| LMArena Chinese | — | 1480 |
| LMArena French | — | 1461 |
| LMArena German | — | 1431 |
| LMArena Japanese | — | 1376 |
| LMArena Korean | — | 1397 |
| LMArena Russian | — | 1422 |
| LMArena Spanish | — | 1404 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Grok 4.6: 75.4 (#63)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
GPT-5.1-Codex: —, Grok 4.6: 44.5 (#66)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena Longer Query | — | 1454 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Grok 4.6: 62.3 (#80)
| Benchmark | GPT-5.1-Codex | Grok 4.6 |
|---|---|---|
| LMArena Text | — | 1428 |
| LMArena Creative Writing | — | 1428 |
| LMArena Multi-Turn | — | 1425 |
Frequently asked questions
Is GPT-5.1-Codex better than Grok 4.6?
Grok 4.6 is the stronger model overall, scoring 56.9 to 38.6 on the Noometry Index.
Which is cheaper, GPT-5.1-Codex or Grok 4.6?
Grok 4.6 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Grok 4.6 better for coding?
Grok 4.6 scores higher on coding benchmarks: 58.5 versus 41.9 in the Noometry coding category.
Which has the bigger context window?
Grok 4.6 does, with 500K tokens against 400K.
How many benchmarks do GPT-5.1-Codex and Grok 4.6 share?
3 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Grok 4.6 has 49.