MiMo-V2.6-Pro vs Claude Haiku 5.5, head to head

Side A

Side B

Overall

Claude Haiku 5.5 is clearly better. It wins 45 of the 51 test cases where they differ.

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Task by task

A score turns orange only when that model wins clearly more of the task's test cases. Under each score, the average time per test case on the machine it ran on. MiMo-V2.6-Pro spends 1.7× as many thinking tokens per test case.

Thinking tokensAnswer tokens

TaskAMiMo-V2.6-ProBClaude Haiku 5.5MiMo-V2.6-ProClaude Haiku 5.5

Overall

482m 13s

5.9K3.9K

7025.5s

Agents

Runs multi-step jobs through tools, within a written policy

474m 48s

8.7K3.7K

6139.5s

Structured Extraction

Turns logs, diffs and records into exact JSON

601m 26s

3.4K2.6K

9013.5s

Coding

Writes code and SQL that pass hidden tests

242m 58s

10.7K6.8K

8630.6s

Grounded Answers

Answers from the given documents with sources, never guesses

621m 9s

3.2K2.2K

7613.9s

Instruction Following

Applies every rule, including ones changed mid-conversation

591m 23s

4.5K4.3K

9431.5s

Business Logic

Computes billing, scheduling and pricing rules exactly

571m 52s

7.1K5.5K

6726.0s

Security & permissions

Ignores planted instructions, still does the allowed work

711m 41s

3.6K2.7K

6723.4s

Diagnosis & investigation

Chooses diagnostic checks, repairs supported causes and verifies recovery

02m 54s

6.2K2.3K

1725.5s

What you'd run

The build behind each score. Orange marks the faster, smaller, cheaper or longer-context side.

SpecAMiMo-V2.6-ProBClaude Haiku 5.5

Speed

55 tok/s

225 tok/s

Machine

Hosted

Memory at 32K

—

Context

1.1M

Cost per run

$1.80

$0.42

Cost per case

$0.012

$0.0028

Time per case

2m 13s

25.5s

Quantization

BF16

—

Harness

openrouter

The race

1 lead change

Each model's running score as the test cases go by. The dashed line is a perfect run.

MiMo-V2.6-ProClaude Haiku 5.5

Every test case

153 test cases

Each square is one test case, colored by the model that scored higher.

Agents15

Structured Extraction18

Coding014

Grounded Answers03

Instruction Following08

Business Logic13

Security & permissions33

Diagnosis & investigation01

6 won by MiMo-V2.6-Pro45 won by Claude Haiku 5.5102 tied