Premium-Tier
- 2026-07-25 | Claude Opus 5: Cost, Benchmarks, and When to Use It Claude Opus 5 pricing, availability, effort levels, independent cost-per-task evidence, migration changes, and practical routing against Sonnet 5 and Fable.
- 2026-06-26 | Claude Opus 4.8 Historical Guide Claude Opus 4.8 historical pricing and benchmark context, retained for older integrations after Opus 5 became the premium Claude baseline.
- 2026-01-30 | Premium LLM Comparison: Opus 5.5, GPT-6, Fable Dated comparisons of Sonnet 5, Opus 5.5, GPT-6, Fable 5, and restricted models; current routing is linked separately from preserved prices and evidence.