Opus 5 looks like a clear upgrade over 4.8, but still trails Fable 5 for brilliance
bindureddy · x · 2026-07-25
A launch-day take says Opus 5 is a strict improvement over Opus 4.8, but still trails Fable 5 in raw brilliance.
- The author estimates Opus 5 is about 15% more expensive than 4.8 on similar tasks.
- They say it is better than 4.8, so it is a clear upgrade.
- However, they still prefer Fable 5 for now and plan to use Opus 5 in their agent and ChatLLM setup immediately.
- LiveBench results are said to be coming soon.
Related event: Anthropic Releases Claude Opus 5: SOTA Performance at Half the Price(128 posts)→
More from Models
- MissionReport benchmark: only 3 of 540 AI-generated government reports pass all criteria — Exp_Mark · 2026-10-27
- Local beats cloud: Qwen 3.8 FN handles private student data as well as frontier models — dr_lm · 2026-10-27
- Aidan Gomez: model's CoT said no tool calls right before making them — aidangomez · 2026-10-27
- Nat Lambert: Cohere's model is narrow RL training on internal infra ill-suited for open weights — natolambert · 2026-10-27
- OpenAI teases DOTS is coming to Europe 'soon' — mark_k · 2026-10-27
- Clifford Pickover challenges AI to decipher a message he encoded in Norse runes — pickover · 2026-10-27