v2.6.0 — Claude Fable 5 tier (--fable/--best) + cloud data-sharing guidance

Added

• Claude Fable 5 support with new `--fable` / `--best` shortcuts (synonyms) following Anthropic's release on 2026-06-09. Fable 5 is Anthropic's most capable model, a tier above Opus. Opus 4.8 remains the default — Fable is opt-in.
  • Anthropic API / Pro: `claude-fable-5`
  • AWS Bedrock: `global.anthropic.claude-fable-5` (global inference profile, same convention as Opus)
  • Vertex AI: `claude-fable-5`
  • Azure Foundry: `claude-fable-5` (default deployment name)
  • Vercel AI Gateway: `anthropic/claude-fable-5` (slug not yet confirmed in Vercel's catalog; overridable)
  • Overridable per provider via `CLAUDE_MODEL_FABLE_{AWS,VERTEX,ANTHROPIC,AZURE,VERCEL}`.
• Graceful fallback on non-Anthropic runtimes: `--fable`/`--best` on Ollama, LM Studio, and Codex falls back to that runtime's highest tier and prints a one-line notice (never errors).
• Cloud data-sharing guidance: runtime hint for `--fable`/`--best` on `--aws`/`--vertex` (Fable 5 is a Covered Model requiring a one-time data-sharing enablement on Bedrock/Vertex), plus enable steps in PROVIDERS.md.

Notes

• Claude Pro/Max: `--fable` works but availability depends on your subscription entitlement.

Full Changelog: https://github.com/jedwhite/airun/compare/v2.5.5...v2.6.0

v2.5.5 — Default Opus 4.8

Default Opus model bumped to 4.8 across all providers following Anthropic's release.

• Anthropic API / Vertex AI / Azure Foundry: claude-opus-4-8
• AWS Bedrock: global.anthropic.claude-opus-4-8 (cross-region global inference profile)
• Vercel AI Gateway / OpenRouter: anthropic/claude-opus-4.8

Pin a prior Opus version across all providers via ~/.ai-runner/secrets.sh if you prefer an older release. Run ai update to upgrade.