AI Radar

Claude Opus 4.1

Retired · Language, Reasoning

Claude Opus 4.1 is a language model in Anthropic's Opus line, offered to paid Claude users, in Claude Code, on the Anthropic API, Amazon Bedrock and Google Cloud Vertex AI at the same price as Claude Opus 4. Anthropic calls it an incremental update to Opus 4 and deployed it under the same ASL-3 Standard. [1] [2]August 5, 2025 [3] Primary source

Timeline of Claude Opus 4.1 →

Claims and evidence

  • Released Primary source[1] [2]August 5, 2025
  • Deprecated Primary source[4]2026-06-05: Claude Opus 4.1 model [2]June 5, 2026
  • Retired Primary source[4]2026-06-05: Claude Opus 4.1 model [2]August 5, 2026
  • Status Retired Primary source[4]Model status
  • Replaced by Claude Opus 4.8Recommended replacement as listed on the deprecations page when checked on 2026-10-01. The release notes entry of 2026-08-05 recommends Claude Opus 5 instead. Primary source[4]2026-06-05: Claude Opus 4.1 model
  • Change · Other Anthropic describes it as an upgrade on agentic tasks, real-world coding and reasoning; the release notes call it an incremental update.Compared with Claude Opus 4 Primary source[1] [2]August 5, 2025
  • Change · Other Does not accept the temperature and top_p parameters in the same request; only one of the two may be set.Compared with Claude Opus 4 Primary source[2]August 5, 2025
  • Feature Reasoning mode Primary source[3]section 2.1
  • Parameters Not disclosedNot disclosed by Anthropic. No claim madeNo source
  • Access consumer app, API, cloud partner Primary source[1]

Lineage

Predecessors

Successors

Based on

Not derived from another model.

Variants and derived

None recorded.

Siblings

None recorded.

All ancestors

All descendants

Variants

No variants recorded in this record.

Related AI Radar coverage

AI Radar coverage starts in June 2026; no coverage linked yet.

All model releases from Anthropic on AI Radar →