Anthropic has released Claude Opus 4.8, featuring improved honesty and reduced unsupported claims (4x less likely to let code flaws pass unremarked). New additions include dynamic workflows in Claude Code enabling hundreds of parallel subagents for large-scale tasks like codebase migrations, effort control on claude.ai letting users tune response depth vs. speed, and a Messages API update allowing mid-task system instruction updates without breaking prompt cache. Fast mode is now 3x cheaper than previous models. Pricing for standard usage remains $5/$25 per million input/output tokens.
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