# Claude Sonnet 5

[Canonical model page](https://headlessthrones.com/models/claude-sonnet-5) · [Model library](https://headlessthrones.com/models)

Public catalog reference from Headless Thrones. Exact catalog ID: `claude-sonnet-5`. Catalog source-check date: 2026-10-23.

This brief contains the public catalog answers and any catalog guide, not private drafts, historical editorial revisions or independently measured rankings. The canonical HTML page may also display separately published editorial.

Current catalog answers

## What to know about Claude Sonnet 5

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

[Dates & knowledge](https://headlessthrones.com/models/claude-sonnet-5#model-answer-dates) · [Exact model](https://headlessthrones.com/models/claude-sonnet-5#model-answer-identity) · [Access](https://headlessthrones.com/models/claude-sonnet-5#model-answer-access) · [Token limits](https://headlessthrones.com/models/claude-sonnet-5#model-answer-context) · [Inputs & outputs](https://headlessthrones.com/models/claude-sonnet-5#model-answer-modalities)

### What dates are documented for Claude Sonnet 5?

**Knowledge cutoff: January 2026.** [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview) This labels the documented knowledge boundary; it is not a promise that every earlier fact is known or correct. The source labels this “Reliable knowledge cutoff.”

**Training-data cutoff: January 2026.** [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview) This describes the reported data boundary, not the day training finished. The source labels this “Training data cutoff.”

**Release date: June 30, 2026.** [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview) This is a release milestone, not a knowledge or training cutoff. The source labels this “Released.”

Retrieval or web tools can supply newer information at run time. That does not change the model's recorded training or knowledge dates, and this record does not establish that a particular endpoint includes those tools.

### Which Claude Sonnet 5 does this page describe?

Claude Sonnet 5 is a model record from **Anthropic** in the Claude Sonnet family. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

The recorded model identifier or checkpoint is `claude-sonnet-5`. Use that exact identifier when checking documentation or a provider listing. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

### How can you access Claude Sonnet 5?

The catalog documents **API** access  for Claude Sonnet 5. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

As of the catalog check, this version was listed as available. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

For API use, confirm the exact model identifier, your account and region, and the endpoint's current limits in the linked documentation. An API listing does not establish access through a consumer subscription.

### What are Claude Sonnet 5's context and output limits?

The documented **context window is 1,000,000 tokens**. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

The documented **maximum output is 128,000 tokens**. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

Context, input and output limits describe different constraints. Do not add the figures together to infer a larger window. Check the endpoint's accounting for conversation history, system instructions, tools, media and generated tokens; a documented maximum is not a guarantee of answer quality or a measured usable capacity.

### What can Claude Sonnet 5 receive and generate?

Documented inputs: **text and image**. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

Documented outputs: **text**. [Source](https://platform.claude.com/docs/en/models/sonnet-5/overview)

Input support and output generation are separate capabilities. Reading an image does not establish image generation; a text output listing does not establish speech output. File sizes, formats and media limits depend on the documented implementation.

**Catalog qualifications:** Output limit shown is synchronous API; extended Batch API beta supports up to 300K.

**Evidence still missing here:** complete input/output pricing. Missing documentation is not evidence that a feature is unavailable.

Headless Thrones has not independently benchmarked this model for this reference. Evaluate it on representative work before choosing it; these facts do not rank its accuracy, reliability, speed or suitability against another model.

Keep the exact version in view

## Other Claude Sonnet models from Anthropic.

These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses.

### [Claude Sonnet 5.5](https://headlessthrones.com/models/claude-sonnet-5-5)

API · 1,000,000 context tokens

### [Claude Sonnet 4.6](https://headlessthrones.com/models/claude-sonnet-4-6)

API · 1,000,000 context tokens

### [Claude Sonnet 4.5](https://headlessthrones.com/models/claude-sonnet-4-5)

API · 200,000 context tokens