Introducing Claude Opus 4.8
Summary
Claude Opus 4.8 is now the world's best AI model with 4x fewer hallucinations than 4.7 (released 45 days prior), featuring user-controlled reasoning effort levels and parallel sub-agent capabilities in Claude Code—all at identical token pricing, making it a direct upgrade for builders prioritizing accuracy over cost.
Key Takeaways
- Opus 4.8 is 4x less likely to hallucinate with stronger alignment; dramatically reduces unsupported claims compared to 4.7, directly addressing the hallucination problem for production use cases.
- Reasoning effort control is now accessible on claude.ai (previously API-only); users can toggle between effort levels to balance speed vs. accuracy, with max effort roughly doubling response time.
- Claude Code can now execute hundreds of parallel sub-agent tasks in a single session, enabling complex multi-step workflows previously requiring sequential processing.
- Token costs remain unchanged from 4.7 despite performance improvements; builders pay identical input/output rates per million tokens, making the upgrade a pure capability gain.
- Opus 4.8 shows measurable improvements in coding and reasoning benchmarks across all tested categories; outperforms ChatGPT 4, Gemini 3.1 Pro on published benchmarks.
Related topics
Transcript Excerpt
Claude just introduced Claude Opus 4.8, which right now is the very best AI model available in the world. And I'll show you some of the benchmarks here, but we're going to take it for a test ourselves. And the really nice thing about it is on top of the new model release, they also give you access to change the reasoning effort. This was previously only locked behind the API. You couldn't just go to the claw.ai website and change the reasoning effort. Obviously, it's going to eat through your credits even faster. Opest has always been one of those models. That is fantastic, but it will use quite a bit of credits here in order to create things. It's also available inside of Claude co-work. It's also available inside of Claude code and the API. Right now, you do need to have the paid version…