Dev Signal Guide
Senior developers running coding agents through AI Gateway who need full-feature agentic task completion rather than partial stubs.
Claude Opus 5 is now available on AI Gateway and is built for long-horizon agentic coding tasks. Unlike previous versions, it handles multi-file refactors and end-to-end feature work natively, completing full features rather than stubs. This cuts both token spend and latency when running at medium reasoning effort levels.
Integration requires AI SDK 7 and the Anthropic provider setup. Reasoning is enabled by default and configurable via a top-level option, with medium effort set using the reasoning parameter in AI SDK 7. Opus 5 replaces both Opus 4 and Opus 4.8 for coding agent workflows.
One operational consideration is safety classifier blocks, which can interrupt agentic runs—especially on security audit code. AI Gateway's native fallback chains let you route to Claude Sonnet 5 or Opus 4.8 automatically without writing manual retry logic.
Dev Signal Verdict
Best for: Senior developers running coding agents through AI Gateway who need full-feature agentic task completion rather than partial stubs.
If you are already routing through AI Gateway and on AI SDK 7, switch from Opus 4 or 4.8 to Opus 5 now and validate with speed: 'fast' before promoting to production. Wire in a fallback to Claude Sonnet 5 or Opus 4.8 to handle safety blocks on security-related prompts.
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Opus 5 replaces Claude Opus 4 and Opus 4.8 for coding agent use cases.
You need AI SDK 7 and the Anthropic provider configured. Opus 5 is not compatible with earlier SDK versions.
Set reasoning: 'medium' as a top-level option in AI SDK 7. Reasoning is on by default, so you configure rather than enable it.
Safety classifiers can block prompts involving security audit code. Use AI Gateway model fallbacks to Claude Sonnet 5 or Opus 4.8 to recover automatically without manual retry logic.
Test speed: 'fast' mode first on latency-sensitive paths before committing to higher reasoning effort levels.
Based on Dev Signal coverage