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// References

Sources & verification notes

Claude Fable 5.1

claude-fable-5-1

  • Exact identifier & access

    Identity and lifecycle apply to this exact identifier and serving surface.

  • First availability

    Effective Sep 1, 2026. Checked Sep 13, 2026. Re-verification needed.

  • Availability status

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Availability status

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Re-checked against the cited page; unchanged.

  • Capabilities & limits

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Capabilities & limits

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Forced tool use (tool_choice any/tool) returns a 400 error on this model; auto and none work.

  • Input price

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

    Derived from the captured rate card's standard token row.

    • Pricing ↗Anthropic · provider-authored · checked Sep 23, 2026

  • Input price

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Derived from the captured rate card's standard token row.

    • Pricing ↗Anthropic · provider-authored · checked Oct 20, 2026

  • Output price

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

    Derived from the captured rate card's standard token row.

    • Pricing ↗Anthropic · provider-authored · checked Sep 23, 2026

  • Output price

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Derived from the captured rate card's standard token row.

    • Pricing ↗Anthropic · provider-authored · checked Oct 20, 2026

  • Model card

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Model card

    Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Official announcement

    Effective Sep 1, 2026. Checked Sep 13, 2026. Re-verification needed.

  • Provider description

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Provider comparison

    Effective Sep 1, 2026. Checked Sep 13, 2026. Re-verification needed.

  • Full rate card

    Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

    • Pricing ↗Anthropic · provider-authored · checked Sep 23, 2026

  • Full rate card

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Re-checked against the cited page; unchanged.

    • Pricing ↗Anthropic · provider-authored · checked Oct 20, 2026

  • License

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Not verified. These sources establish the identifier, not this missing fact.

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