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

TaskAClaude Haiku 5.5BMiMo-V2.6-ProClaude Haiku 5.5MiMo-V2.6-Pro

Overall

7025.5s

3.9K5.9K

482m 13s

Agents

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

6139.5s

3.7K8.7K

474m 48s

Structured Extraction

Turns logs, diffs and records into exact JSON

9013.5s

2.6K3.4K

601m 26s

Coding

Writes code and SQL that pass hidden tests

8630.6s

6.8K10.7K

242m 58s

Grounded Answers

Answers from the given documents with sources, never guesses

7613.9s

2.2K3.2K

621m 9s

Instruction Following

Applies every rule, including ones changed mid-conversation

9431.5s

4.3K4.5K

591m 23s

Business Logic

Computes billing, scheduling and pricing rules exactly

6726.0s

5.5K7.1K

571m 52s

Security & permissions

Ignores planted instructions, still does the allowed work

6723.4s

2.7K3.6K

711m 41s

Diagnosis & investigation

Chooses diagnostic checks, repairs supported causes and verifies recovery

1725.5s

2.3K6.2K

02m 54s

What you'd run

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

SpecAClaude Haiku 5.5BMiMo-V2.6-Pro

Speed

225 tok/s

55 tok/s

Machine

Hosted

Memory at 32K

—

Context

1.1M

Cost per run

$0.42

$1.80

Cost per case

$0.0028

$0.012

Time per case

25.5s

2m 13s

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.

Claude Haiku 5.5MiMo-V2.6-Pro

Every test case

153 test cases

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

Agents51

Structured Extraction81

Coding140

Grounded Answers30

Instruction Following80

Business Logic31

Security & permissions33

Diagnosis & investigation10

45 won by Claude Haiku 5.56 won by MiMo-V2.6-Pro102 tied