Claude Opus 4.7 GA release introduces API breaking changes vs Opus 4.6 and tokenizer updates — migrate per release notes

AI Impact Summary

Claude Opus 4.7 GA adds capability improvements and tokenizer changes, and it introduces API-breaking changes relative to Opus 4.6. This requires updating client integrations to conform to the new API contract and migration guidance in the release notes. The tokenizer change can alter token counts and pricing behavior for the same prompts, so performance and cost forecasting should be revalidated in staging before production rollout.