Model comparison
GPT-5.1-Codex vs MiniMax-M2.1
GPT-5.1-Codex and MiniMax-M2.1 score almost the same on the Noometry Index (38.2 vs 38.4), so choose on price, context window or the category you care about most.
Last verified . 3 shared benchmarks.
MiniMaxSummary
- They share 3 benchmarks with published results for both. GPT-5.1-Codex scores higher in 2 categories and MiniMax-M2.1 in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 37.8 to 27.7.
- The biggest single-benchmark swing is Terminal-Bench: 60.4% for GPT-5.1-Codex and 36.6% for MiniMax-M2.1.
- MiniMax-M2.1 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 205K.
- MiniMax-M2.1 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | MiniMax-M2.1 | |
|---|---|---|
| Provider | OpenAI | MiniMax |
| Noometry Index | 38.2 | 38.4 |
| Released | 2025-11-12 | 2025-12-23 |
| Weights | Proprietary | Open |
| Context window | 400K | 205K |
| Max output | 128K | 131K |
| Input $ / M tokens | $1.25 | $0.30 |
| Output $ / M tokens | $10 | $1.20 |
| Results tracked | 6 | 22 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.7 (#107), MiniMax-M2.1: 40.1 (#132)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| LMArena WebDev | 1337 | 1384 |
| ALE-Bench | 1,245 | 623.83 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena Coding | — | 1421 |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 37.8 (#32), MiniMax-M2.1: 27.7 (#91)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| Terminal-Bench | 60.4% | 36.6% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 15.8 (#301)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| NYT Connections (extended) | — | 11.2% |
| LMArena Hard Prompts | — | 1410 |
Math MiniMax-M2.1 leads
GPT-5.1-Codex: 29.3 (#218), MiniMax-M2.1: 35.6 (#142)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1396 |
Knowledge Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 37.7 (#143)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| Vectara Hallucination Rate | — | 11.8% |
| LMArena Expert | — | 1432 |
Multilingual Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 50.2 (#123)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| LMArena Non-English | — | 1378 |
| LMArena Chinese | — | 1430 |
| LMArena French | — | 1405 |
| LMArena German | — | 1380 |
| LMArena Japanese | — | 1287 |
| LMArena Korean | — | 1297 |
| LMArena Russian | — | 1386 |
| LMArena Spanish | — | 1396 |
Instruction Following Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 74.0 (#108)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| LMArena Instruction Following | — | 1399 |
Long Context Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 43.2 (#98)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| LMArena Longer Query | — | 1416 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, MiniMax-M2.1: 58.5 (#114)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.1 |
|---|---|---|
| LMArena Text | — | 1392 |
| LMArena Creative Writing | — | 1362 |
| LMArena Multi-Turn | — | 1396 |
Frequently asked questions
Is GPT-5.1-Codex better than MiniMax-M2.1?
GPT-5.1-Codex and MiniMax-M2.1 score almost the same on the Noometry Index (38.2 vs 38.4), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.1-Codex or MiniMax-M2.1?
MiniMax-M2.1 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or MiniMax-M2.1 better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 205K.
How many benchmarks do GPT-5.1-Codex and MiniMax-M2.1 share?
3 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and MiniMax-M2.1 has 22.