Model comparison
GPT-5.1-Codex vs MiniMax-M2.5
GPT-5.1-Codex and MiniMax-M2.5 score almost the same on the Noometry Index (38.6 vs 38.3), so choose on price, context window or the category you care about most.
Last verified . 5 shared benchmarks.
MiniMaxSummary
- They share 5 benchmarks with published results for both. GPT-5.1-Codex scores higher in 2 categories and MiniMax-M2.5 in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 38.0 to 30.4.
- The biggest single-benchmark swing is Terminal-Bench: 60.4% for GPT-5.1-Codex and 42.7% for MiniMax-M2.5.
- MiniMax-M2.5 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-M2.5 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | MiniMax-M2.5 | |
|---|---|---|
| Provider | OpenAI | MiniMax |
| Noometry Index | 38.6 | 38.3 |
| Released | 2025-11-12 | 2026-02-12 |
| 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 | 33 |
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Category by category
Coding MiniMax-M2.5 leads
GPT-5.1-Codex: 41.9 (#116), MiniMax-M2.5: 48.1 (#58)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | 75.8% |
| LMArena WebDev | 1337 | 1387 |
| ALE-Bench | 1,245 | 618.17 |
| SWE-bench Multilingual | — | 68.3% |
| LMArena Coding | — | 1381 |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), MiniMax-M2.5: 30.4 (#77)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| Terminal-Bench | 60.4% | 42.7% |
| METR Time Horizons | 70.8% | — |
| Vending-Bench 2 | — | -23.16 |
Reasoning Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 17.5 (#292)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 55.2% |
| NYT Connections (extended) | — | 16.8% |
| ARC-AGI-1 | — | 63.7% |
| LMArena Hard Prompts | — | 1372 |
| Epoch Capabilities Index | — | 146.68 |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), MiniMax-M2.5: 26.9 (#253)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| ProofBench | 9% | 4% |
| LMArena Math | — | 1378 |
Knowledge Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 39.2 (#135)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| Vectara Hallucination Rate | — | 9.1% |
| LMArena Expert | — | 1379 |
Multilingual Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 47.1 (#152)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| LMArena Non-English | — | 1338 |
| LMArena Chinese | — | 1393 |
| LMArena French | — | 1362 |
| LMArena German | — | 1362 |
| LMArena Japanese | — | 1171 |
| LMArena Korean | — | 1232 |
| LMArena Russian | — | 1358 |
| LMArena Spanish | — | 1354 |
Instruction Following Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 71.5 (#148)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1353 |
Long Context Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 37.5 (#216)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| CL-bench | — | 11.4% |
| CL-bench Life | — | 6.3% |
| LMArena Longer Query | — | 1366 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, MiniMax-M2.5: 53.9 (#153)
| Benchmark | GPT-5.1-Codex | MiniMax-M2.5 |
|---|---|---|
| LMArena Text | — | 1359 |
| LMArena Creative Writing | — | 1331 |
| EQ-Bench Creative Writing | — | 1361 |
| LMArena Multi-Turn | — | 1364 |
Frequently asked questions
Is GPT-5.1-Codex better than MiniMax-M2.5?
GPT-5.1-Codex and MiniMax-M2.5 score almost the same on the Noometry Index (38.6 vs 38.3), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.1-Codex or MiniMax-M2.5?
MiniMax-M2.5 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-M2.5 better for coding?
MiniMax-M2.5 scores higher on coding benchmarks: 48.1 versus 41.9 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-M2.5 share?
5 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and MiniMax-M2.5 has 33.