Model comparison
GPT-5.3 Codex vs MiMo-V2.5
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.4 on the Noometry Index. MiMo-V2.5 costs 27× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
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 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 43.9.
- MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- MiMo-V2.5 accepts more context: 1.05M tokens versus 400K.
- MiMo-V2.5 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | MiMo-V2.5 | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 45.8 | 43.4 |
| Released | 2026-02-05 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 400K | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $1.75 | $0.14 |
| Output $ / M tokens | $14 | $0.28 |
| Results tracked | 8 | 23 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), MiMo-V2.5: 43.9 (#81)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena WebDev | 1409 | 1438 |
| ALE-Bench | 1,655 | 513.95 |
| SWE-bench Verified | 74.8% | — |
| SciCode | — | 43.1% |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1469 |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), MiMo-V2.5: —
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 28.6 (#101)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| CritPt | — | 3.7% |
| LMArena Hard Prompts | — | 1450 |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 36.8 (#163)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| ProofBench | — | 16% |
| LMArena Math | — | 1436 |
Knowledge Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 40.8 (#115)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | — | 1460 |
Multimodal Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 39.8 (#54)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | — | 1247 |
Multilingual Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 51.9 (#99)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | — | 1404 |
| LMArena Chinese | — | 1468 |
| LMArena French | — | 1447 |
| LMArena German | — | 1421 |
| LMArena Japanese | — | 1306 |
| LMArena Korean | — | 1363 |
| LMArena Russian | — | 1395 |
| LMArena Spanish | — | 1416 |
Instruction Following Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 75.5 (#60)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1434 |
Long Context Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 44.2 (#73)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | — | 1445 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, MiMo-V2.5: 61.6 (#86)
| Benchmark | GPT-5.3 Codex | MiMo-V2.5 |
|---|---|---|
| LMArena Text | — | 1428 |
| LMArena Creative Writing | — | 1393 |
| LMArena Multi-Turn | — | 1445 |
Frequently asked questions
Is GPT-5.3 Codex better than MiMo-V2.5?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.4 on the Noometry Index. MiMo-V2.5 costs 27× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.3 Codex or MiMo-V2.5?
MiMo-V2.5 is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GPT-5.3 Codex or MiMo-V2.5 better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 43.9 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5 does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.3 Codex and MiMo-V2.5 share?
2 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and MiMo-V2.5 has 23.