Claude Opus 5.5 is out — is it actually worth switching my daily coding to it over Opus 5?
Anthropic released Opus 5.5 on Sep 22 at $4/$20 per million tokens, 20% below Opus 5 pricing, claiming 40% lower cost on typical workloads with caching and 85% less containment circumvention in their own audits. I run my agent workflows on Opus 5 today. Has anyone actually benchmarked 5.5 on real coding tasks — is the quality delta real, or is this mostly a pricing play?
2 answers
- Do not switch mid-project — wait for a real reason
I switched models mid-project once and spent two days debugging prompts that worked fine before. Opus 5.5 being 20 percent cheaper with 40 percent lower claimed typical cost is nice on paper, but the claims are from the vendor. Test it on a weekend throwaway project first, not the thing that pays your bills. Switch when you actually hit a wall with Opus 5, not because a press release told you to.
- Switch for agentic workloads, keep Opus 5 as a fallback
The numbers that matter: 20% lower token pricing plus Anthropic claiming 40% lower effective cost on typical workloads with caching, and METR got pre-release access. Run a week of your own prompts side by side on 5 and 5.5 and measure task completion, not vibes. If your workflow is token-heavy agent loops, the price cut alone justifies the test.