MiMo v2.5 Pro vs MiMo v2.6 Pro
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
MiMo v2.5 Pro1,434
MiMo v2.6 Pro1,445
Lech Mazur Short-Story Lech Mazur Short-Story · comparison score: Judges compare stories written to ten required elements; the comparison score can be negative
MiMo v2.5 Pro-0.7
MiMo v2.6 Pro1.6
EQ-Bench Longform Creative Writing 1.11 Longform Creative Writing 1.11: Models plan, revise and write a story across eight turns, graded with a writing rubric
MiMo v2.5 Pro73.7
MiMo v2.6 Pro—
EQ-Bench Creative Writing v3 Creative Writing v3 · Elo: Judge-rated creative writing under the v3 prompt set and pairwise ranking
MiMo v2.5 Pro1,493.4
MiMo v2.6 Pro—
IFBench (instructions) IFBench (instructions): Checks whether the model follows precise formatting and content instructions
MiMo v2.5 Pro79.9
MiMo v2.6 Pro—
| Benchmark | MiMo v2.5 Pro | MiMo v2.6 Pro |
|---|---|---|
| Arena Text · creative writing | 1,434 | 1,445 |
| Lech Mazur Short-Story | -0.7 | 1.6 |
| EQ-Bench Longform Creative Writing 1.11 | 73.7 | — |
| EQ-Bench Creative Writing v3 | 1,493.4 | — |
| IFBench (instructions) | 79.9 | — |
Specs
| Spec | MiMo v2.5 Pro | MiMo v2.6 Pro |
|---|---|---|
| Input, per 1M | $0.43 | $0.43 |
| Output, per 1M | $0.87 | $0.87 |
| Cost per task? | $0.054 | $0.13 |
| Speed, tok/s | 46 | 54 |
| Context | 1M | 1M |
| Weights | Open | Open |
| Released | Apr 2026 | Sep 2026 |
| Memory (4-bit) | 614 GB | 615 GB |
| Licence | MIT | MIT |
| Commercial use | Allowed | Allowed |
| See images | — | ✓ |
| Read PDFs | — | — |
| Hear audio | — | ✓ |
| Watch video | — | ✓ |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ? |
| Run code | ? | ? |
| Use a computer | ? | ? |
What breaks when you switch
MiMo v2.5 Pro → MiMo v2.6 Pro
Memory (4-bit): 614 GB → 615 GB
Pass back reasoning_content›
In deep-thinking multi-turn tool conversations, return the full reasoning_content in later rounds with tool calls or receive HTTP 400.
Forced recommended defaults›
Deep thinking overrides supplied temperature and top_p with 1.0 and 0.95.
Avoid answer truncation›
max_completion_tokens includes thinking and the final answer; reserve enough tokens to avoid truncating the answer.
MOPD checkpoints address tool-call repetition›
Use the MOPD checkpoints for the tool-call repetition fix; the API has served the updated models since September 25 at 06:00 UTC+8 under unchanged names.
MiMo v2.6 Pro → MiMo v2.5 Pro