Anthropic releases Claude API 2026-10-21 version, removing three sampling parameters

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Anthropic 3 First update in years Claude API: Three commonly used parameters removed; old code may throw errors after upgrading

Beating AI Newsflash: Anthropic has released Claude API a new version `2026-10-21`, marking the first official version-number update since 2023 June.

Over the past 3 years, Claude models have continued to iterate, while the API version remained unchanged. Anthropic plans to update API more frequently going forward, allowing developers to adapt in advance to compatibility issues that new models may introduce.

This update mainly removes the three parameters `temperature`、`top_p` and `top_k`. They were originally used to control the randomness of model responses and generation methods. After upgrading to the new API version, code that continues to pass these parameters will throw errors directly. Some other legacy fields and message formats have also been adjusted.

Anthropic has simultaneously updated the official SDK, and the new version uses `2026-10-21` by default. Developers can use Claude Code's `/claude-api` Skill to help modify their code.

However, the legacy `2023-06-01` remains available, and existing projects do not need to migrate immediately.

Original link https://m.theblockbeats.info/flash/373120

Key points

Anthropic releases Claude API a new version `2026-10-21`。
This is Claude API the first official version-number update since 2023 June.
The new version removes the three parameters `temperature`、`top_p` and `top_k`.
After upgrading to the new API version, code that still passes the above parameters will throw errors directly.
Some other legacy fields and message formats have also been adjusted.
Anthropic has simultaneously updated the official SDK, and the new version uses `2026-10-21`。
Developers can use Claude Code's `/claude-api` Skill to help modify their code.
The legacy `2023-06-01` remains available, and existing projects do not need to migrate immediately.

AI-assisted interpretation

The following is analysis, separate from reported facts. Verify important claims independently.

This update will change certain Claude API invocation methods. Beginners need to check whether their code passes the three removed parameters; if they do not migrate for now, evidence indicates that the legacy API is currently still available.

Why it matters to readers

Projects using the new official SDK or switching to the new API may throw errors due to legacy parameters, so existing invocation code needs to be reviewed and modified before upgrading.

If you are learning or using Claude API, first confirm the API version in use, and pay particular attention to the `temperature`、`top_p` and `top_k` parameters.

Risks and unknowns

The evidence comes from a newsflash, not the original text of an official Anthropic announcement.
The other adjusted legacy fields and message formats are not specified.
The support period and deprecation arrangements for the legacy `2023-06-01` are not specified.

Anthropic releases Claude API 2026-10-21 version, removing three sampling parameters

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