Model comparison
GPT-5.3 Codex vs MiMo-V2.5-Pro
GPT-5.3 Codex and MiMo-V2.5-Pro score almost the same on the Noometry Index (45.8 vs 45.2), so choose on price, context window or the category you care about most.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. GPT-5.3 Codex scores higher in 1 category and MiMo-V2.5-Pro in 0 categories; one gap is clear of the uncertainty.
- MiMo-V2.5-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- MiMo-V2.5-Pro accepts more context: 1.05M tokens versus 400K.
- MiMo-V2.5-Pro has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | MiMo-V2.5-Pro | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 45.8 | 45.2 |
| Released | 2026-02-05 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 400K | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $1.75 | $0.43 |
| Output $ / M tokens | $14 | $0.87 |
| Results tracked | 8 | 27 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), MiMo-V2.5-Pro: 47.4 (#60)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena WebDev | 1409 | 1479 |
| ALE-Bench | 1,655 | 899.8 |
| SWE-bench Verified | 74.8% | — |
| SciCode | — | 50.2% |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1503 |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), MiMo-V2.5-Pro: —
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 26.8 (#130)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| NYT Connections (extended) | — | 34.4% |
| CritPt | — | 4% |
| LMArena Hard Prompts | — | 1488 |
| DTBench | — | 84.5% |
| LMCA | — | 29.5% |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 40.0 (#96)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| ProofBench | — | 22% |
| LMArena Math | — | 1481 |
Knowledge Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 42.2 (#98)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Expert | — | 1503 |
Multilingual Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 55.1 (#34)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Non-English | — | 1449 |
| LMArena Chinese | — | 1507 |
| LMArena French | — | 1488 |
| LMArena German | — | 1458 |
| LMArena Japanese | — | 1412 |
| LMArena Korean | — | 1437 |
| LMArena Russian | — | 1450 |
| LMArena Spanish | — | 1471 |
Instruction Following Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 77.5 (#21)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Instruction Following | — | 1477 |
Long Context Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 45.4 (#37)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Longer Query | — | 1483 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, MiMo-V2.5-Pro: 65.3 (#49)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Text | — | 1465 |
| LMArena Creative Writing | — | 1440 |
| EQ-Bench Creative Writing | — | 1493 |
| EQ-Bench 4 | — | 1208 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is GPT-5.3 Codex better than MiMo-V2.5-Pro?
GPT-5.3 Codex and MiMo-V2.5-Pro score almost the same on the Noometry Index (45.8 vs 45.2), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.3 Codex or MiMo-V2.5-Pro?
MiMo-V2.5-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GPT-5.3 Codex or MiMo-V2.5-Pro better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 47.4 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5-Pro does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.3 Codex and MiMo-V2.5-Pro share?
2 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and MiMo-V2.5-Pro has 27.