According to Anthropic, AWS Claude Fable 5 is the most capable widely released model, built for the most demanding reasoning and long-horizon agentic work.
Model details
| Item | Value | Description |
|---|
| Model name | AWS Claude Fable 5 | The name of the model. |
| Model category | Premium | The category of the model: Standard or Premium. |
| API model name | aws__claude_fable_5 | The name of the model that is used in the . You must provide this exact name for the API to work. |
| Compliance | N/A | Government compliance frameworks and authorizations applicable to this model. |
| Hosting layer | Amazon Web Services (AWS) | The trusted organization that securely hosts the LLM. |
| Model provider | Anthropic | The organization that provides this model. |
| Release date | July 1st, 2026 | The release date for the model. |
| Knowledge cutoff date | January 2026 | The date after which the model does not get any information updates. |
| Input context window | 1m tokens | The number of tokens supported by the input context window. |
| Maximum output tokens | 128k tokens | The number of tokens that can be generated by the model in a single request. |
| Empirical throughput | Not specified | The number of tokens the model can generate per second. |
| Open source | No | Specifies if the model’s code is available for public use. |
Additional documentation
For additional information, see .
Last modified on July 8, 2026
