How long does the Anthropic batch API actually take?

Half of claude-haiku-4-5 jobs finished within 2 min and nine in ten within 4 min, across 308 measured completions in the last 30 days.

Is that faster than Anthropic's 24-hour window?

Far faster for the typical job. Anthropic guarantees completion within 24 hours; the measured medians above are minutes, not hours. The 24-hour window is the contract, not the experience.

How long does the Anthropic Message Batches API take? - measured

The answer

We have measured this. Across the 1 Anthropic model we have enough completions for, the median wait ranges from 2 min (claude-haiku-4-5) to 2 min (claude-haiku-4-5). Nine in ten claude-haiku-4-5 jobs finished within 4 min. Every figure carries n and a confidence grade on its own page.

Anthropic promises only "within 24 hours" - a ceiling, not a typical wait. The measured medians above are what jobs actually get, and they are why batching is worth the wait for most workloads.

Questions this answers

How long does the Anthropic batch API actually take?: Half of claude-haiku-4-5 jobs finished within 2 min and nine in ten within 4 min, across 308 measured completions in the last 30 days.
Is that faster than Anthropic's 24-hour window?: Far faster for the typical job. Anthropic guarantees completion within 24 hours; the measured medians above are minutes, not hours. The 24-hour window is the contract, not the experience.

See it live

Every number here is measured, and it is all public.

The live dashboard shows every model with its distribution, n and confidence grade. /v1/coverage is the same data as JSON, no key required. Contributing five measurements in seven days cuts the public delay to five minutes and unlocks the decision endpoints (/v1/should-i-batch, /v1/estimate-batchtime).

How long does the Anthropic Message Batches API take?

The answer

Questions this answers

See it live

Every number here is measured, and it is all public.

More questions we have measured the answer to