Anthropic
Claude 4 (Opus 4 and Sonnet 4)
Announced May 22, 2025
Longer coding workflows
01
What could it do?
The models handled long multi step coding tasks and used tools like web search while reasoning, and Claude Code became generally available.
02
What changed?
Introduced Opus 4 and Sonnet 4, with extended thinking and tool use.
WHY IT MATTERED
Coding workflows
Launched alongside general availability of Claude Code.
03
Which version is this?
This is a family announcement, not a single model. Benchmarks need a specific variant.
Research draft
Capabilities describe the developer’s announcement. This entry has not completed source review.
Read original sourceBenchmark results
No comparable ECI score is available for this release in our source snapshot. Missing scores are never estimated.