📝 Executive Summary
Claude Opus 4.6, urgently released on February 5, 2026, has completely dispelled concerns about
"Lobotomy" (performance degradation) seen in the previous model (4.5).
Its most significant features are the "1 Million Token (1M Context)" support—a
first for the Opus class—and "Agent Teams" which bundles multiple autonomous
agents.
Establishing itself not just as a chatbot but as a "Project Manager", it has recorded the world's
highest score in knowledge work benchmarks (GDPval-AA), far outstripping GPT-5.2.
💰 Pricing Details
- Claude Pro: $20/month (Web UI usage)
- API Pricing: Costs remain unchanged, but "Adaptive Thinking" improves effective token consumption efficiency.
- Microsoft Foundry: Available immediately in secure enterprise environments.
🎯 Key Benchmark Results
| Benchmark | Score | Evaluation |
|---|---|---|
| Terminal-Bench 2.0 | State-of-the-Art | World #1 in Agent Operation |
| Humanity's Last Exam | Global No.1 | Top among all models in composite reasoning |
| BigLaw Bench (Legal) | 90.2% | Practical level for legal/contract review |
✅ Pros and Cons
👍 Pros
- Overwhelming knowledge reasoning capability surpassing GPT-5.2
- Does not "get lost" even with 1M token ultra-long context
- "Adaptive Thinking" automatically manages thought resources
👎 Cons
- Agent features are too strong (tendency to proceed with tasks without user permission)
- Some features are still limited in the Web UI (claude.ai)
💭 User Reviews (Immediately Post-Release)
Positive Opinions
"The sluggishness of 4.5 is gone. The old 'too smart' Claude is back!"
"I fed it 10,000 lines of code and it identified the bug instantly. The 1M context is not just for show."
Negative Opinions
"It tries to complete tasks in the background without asking, which is a bit scary (feeling of loss of control)."
📊 Conclusion and Overall Rating
Overall Rating: ⭐⭐⭐⭐⭐ (4.9/5.0)
Claude Opus 4.6 is currently "the smartest AI available to humanity."
Whether it's coding, long-context summarization, or complex agent operations, it has no blind
spots. Especially users who were disappointed with 4.5 should experience the performance of this
"fully revived" champion.
