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The author admits they were wrong: Opus 5 outperforms Fable 5 on nearly every benchmark at half the cost, recommending it as the default in Claude Code.
- Claude Code
- 对比
- Fable 5
- Opus 5
- 成本效率
Claude Opus 5 has entered Agent Arena, where it will be evaluated on millions of real-world agentic tasks using web search, filesystem, and terminal tools. Scores coming soon.
- Agent Arena
- 性能测试
- Claude Opus 5
Anthropic has just announced the launch of the new Claude Opus 5 AI model.
- 发布
- Claude Opus 5
Anthropic announces major updates for Claude Opus 5, including longer context windows, improved reasoning, and new safety features.
- New Features
- Claude Opus 5
- Rant
Opus 5 beats Fable 5 in every benchmark but didn't need government approval? 😭
Published Jul 24, 2026A user complains that Opus 5 outperforms Fable 5 in every benchmark yet avoided the extensive regulatory approvals that Fable 5 required.
- 吐槽
- Fable 5
- Opus 5
Claude Opus 5 is now available in Claude Code and on the Claude Platform, with some details worth noting.
- Claude Code
- 上线
- Claude Opus 5
- Launch
Opus 5 Launch: My Favorite Graphs – More Token-Efficient, Smarter, and My Go-To for Coding
Published Jul 24, 2026The Anthropic team shared their favorite graphs from the Opus 5 launch, highlighting the model's token efficiency and intelligence improvements. The author finds it smooth to use and prefers it over Fable 5 for many coding tasks.
- Anthropic
- coding
- Fable 5
- token efficiency
- Opus 5
A user exclaims that Opus 5 is dominating Fable 5 in benchmarks, saying 'it's so over, man.'
- benchmark
- Fable 5
- Opus 5
- News
JUST IN: Anthropic unveils Opus 5 with Fable 5-level features at half the cost
Published Jul 24, 2026Anthropic has officially launched Opus 5, offering features comparable to Fable 5 at half the cost.
- Anthropic
- cost
- AI model
- Fable 5
- Opus 5
- Discussion
Insane Opus 5 numbers: faster iteration, scaled RL, 85% fewer classifier interventions
Published Jul 24, 2026A user discusses Opus 5's impressive metrics: faster iteration speed and scaled RL (Fable 5 is too large for RL yet). On safety, classifiers are expected to intervene about 85% less than Fable 5.
- RL
- safeguards
- classifier
- Opus 5
- iteration speed