Sources & verification notes

Claude Sonnet 5.5

• Exact identifier & access

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

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• First availability

  Effective Sep 28, 2026. Checked Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026
  • Introducing Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Availability status

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026
  • Structured outputs ↗Anthropic · provider-authored · checked Oct 1, 2026

• Input price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

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

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 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 Oct 1, 2026.

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

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 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 Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Official announcement

  Effective Sep 28, 2026. Checked Oct 1, 2026.

  • Introducing Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Provider description

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Provider comparison

  Effective Sep 28, 2026. Checked Oct 1, 2026.

  • Introducing Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Full rate card

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026

• Full rate card

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

  Corrects cache reads to $0.10: the pricing page prices cache hits on Sonnet 5.5 at 0.05x the base input price, not 0.1x.

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

• License

  Effective date not established; this is an observation. Checked Oct 1, 2026.

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

  • Claude Sonnet 5.5 ↗Anthropic · provider-authored · checked Oct 1, 2026