{
  "schema_version": "1.0",
  "id": "archive:https://vercel.com/changelog/claude-fable-5-access-restored-on-ai-gateway",
  "slug": "claude-fable-5-access-restored-on-ai-gateway-02xps4t",
  "url": "https://feed7.dev/p/claude-fable-5-access-restored-on-ai-gateway-02xps4t",
  "title": "Claude Fable 5 access restored on AI Gateway",
  "why_included": "Claude Fable 5 is back on Vercel's AI Gateway after US export controls lifted. New, stricter safety classifiers can refuse routine coding calls, so configure model fallbacks; no Zero Data Retention (30-day hold).",
  "summary": "**The gist** **Claude Fable 5**, Anthropic's Mythos-class model, is back on Vercel's AI Gateway after the **US Government lifted export controls**; it's the same model that was live **June 9–12**, now behind updated, more robust **safety classifiers**. Call it as anthropic/claude-fable-5.",
  "practical_implication": "**Why it matters** Configure **model fallbacks**: even routine **coding and debugging** requests may trip the classifiers, and the Gateway then tries your fallback list (e.g. **Opus 4.8**, Sonnet 5) in order, so agent pipelines keep running through refusals.",
  "agent_context": "**The gist** **Claude Fable 5**, Anthropic's Mythos-class model, is back on Vercel's AI Gateway after the **US Government lifted export controls**; it's the same model that was live **June 9–12**, now behind updated, more robust **safety classifiers**. Call it as anthropic/claude-fable-5.\n\n**Why it matters** Configure **model fallbacks**: even routine **coding and debugging** requests may trip the classifiers, and the Gateway then tries your fallback list (e.g. **Opus 4.8**, Sonnet 5) in order, so agent pipelines keep running through refusals.\n\n**Watch out** No **Zero Data Retention** — prompts and completions are retained for **30 days** (not used for training) because some misuse patterns only appear across cumulative requests; that's a blocker if your contracts require ZDR.",
  "source": {
    "name": "Vercel",
    "url": "https://vercel.com/changelog/claude-fable-5-access-restored-on-ai-gateway",
    "published_at": null
  },
  "source_class": "blog_post",
  "content_type": "Engineering Post",
  "layer": "model",
  "domains": [
    "coding"
  ],
  "topics": [
    "gateways",
    "model-selection",
    "agent-reliability"
  ],
  "verification": {
    "status": "official_source",
    "label": "Official Source",
    "method": "source_feed",
    "verified_at": null
  },
  "uncertainty": [
    "No **Zero Data Retention** — prompts and completions are retained for **30 days** (not used for training) because some misuse patterns only appear across cumulative requests; that's a blocker if your contracts require ZDR."
  ],
  "lifecycle": "Current",
  "published_at": null,
  "modified_at": null,
  "supersedes": [],
  "expires_at": null,
  "formats": {
    "html": "https://feed7.dev/p/claude-fable-5-access-restored-on-ai-gateway-02xps4t",
    "json": "https://feed7.dev/p/claude-fable-5-access-restored-on-ai-gateway-02xps4t.json",
    "markdown": "https://feed7.dev/p/claude-fable-5-access-restored-on-ai-gateway-02xps4t.md"
  }
}