Model comparison
GPT-5.1-Codex vs MiMo-V2.6-Flash
MiMo-V2.6-Flash is the stronger model overall, scoring 44.4 to 38.2 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where MiMo-V2.6-Flash leads 37.4 to 29.3.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- MiMo-V2.6-Flash accepts more context: 1.05M tokens versus 400K.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | MiMo-V2.6-Flash | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 38.2 | 44.4 |
| Released | 2025-11-12 | 2026-09-22 |
| Weights | Proprietary | Open |
| Context window | 400K | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $1.25 | $0.14 |
| Output $ / M tokens | $10 | $0.28 |
| Results tracked | 6 | 13 |
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Category by category
Coding MiMo-V2.6-Flash leads
GPT-5.1-Codex: 41.7 (#107), MiMo-V2.6-Flash: 44.3 (#68)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1516 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 37.8 (#32), MiMo-V2.6-Flash: —
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 29.6 (#82)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Hard Prompts | — | 1481 |
Math MiMo-V2.6-Flash leads
GPT-5.1-Codex: 29.3 (#218), MiMo-V2.6-Flash: 37.4 (#97)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1477 |
Knowledge Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 42.0 (#91)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Expert | — | 1516 |
Multimodal Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 40.2 (#39)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | — | 1266 |
Multilingual Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 54.6 (#41)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | — | 1439 |
| LMArena Chinese | — | 1501 |
| LMArena Russian | — | 1424 |
Instruction Following Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 77.0 (#33)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1463 |
Long Context Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 44.8 (#52)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | — | 1465 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, MiMo-V2.6-Flash: 63.9 (#61)
| Benchmark | GPT-5.1-Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | — | 1459 |
| LMArena Creative Writing | — | 1408 |
| LMArena Multi-Turn | — | 1460 |
Frequently asked questions
Is GPT-5.1-Codex better than MiMo-V2.6-Flash?
MiMo-V2.6-Flash is the stronger model overall, scoring 44.4 to 38.2 on the Noometry Index.
Which is cheaper, GPT-5.1-Codex or MiMo-V2.6-Flash?
MiMo-V2.6-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or MiMo-V2.6-Flash better for coding?
MiMo-V2.6-Flash scores higher on coding benchmarks: 44.3 versus 41.7 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.6-Flash does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.1-Codex and MiMo-V2.6-Flash share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and MiMo-V2.6-Flash has 13.