> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognite.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Language model library

> Detailed reference of available language models in Atlas AI, including stable, legacy, and retired models with release and retirement dates.

Choose the right model based on your requirements for speed, quality, and context length. The availability of language models depends on your preferred cloud vendor and [the location](/cdf/admin/clusters_regions) of your Cognite Data Fusion (CDF) project.

Cognite continuously refreshes language models with newer and more capable models for building agents. As part of this process, Cognite retires older models.

These terms describe lifecycle stages and important dates for language models available in Atlas AI:

* **Stable model**: A released model version **supported for production use**. Stable models include a retirement date when Cognite Atlas AI will no longer support them.

  * [**Latest stable model**](#latest-stable-models): The most current version within the model family, recommended for new agents or agents in development. Use this model when migrating from older versions.

  * **Legacy stable model**: An older model version that the latest stable model has replaced. While Atlas AI still supports legacy models, migrate to the latest model to access new features and improvements.

* **Recommended upgrade**: The latest stable model to migrate to for improved performance and additional features.

* **Retired model**: A model version that Atlas AI has permanently deactivated after reaching its retirement date. Atlas AI no longer supports retired models. If you don't migrate agents using retired models before the retirement date, they automatically upgrade to the latest stable model.

### Latest stable models

| Model ID              | Release date   | Retirement date                    |
| --------------------- | -------------- | ---------------------------------- |
| azure/gpt-5.4         | March 2026     | No earlier than April 29, 2027     |
| azure/gpt-5.2         | March 2026     | No earlier than April 29, 2027     |
| azure/gpt-5.1         | January 2026   | No earlier than November 13, 2026  |
| azure/gpt-5           | August 2025    | No earlier than July 15, 2026      |
| azure/gpt-5-mini      | August 2025    | No earlier than July 15, 2026      |
| azure/gpt-5-nano      | August 2025    | No earlier than July 15, 2026      |
| azure/gpt-4.1         | August 2025    | No earlier than April 1, 2026      |
| azure/gpt-4.1-nano    | August 2025    | No earlier than April 1, 2026      |
| azure/gpt-4.1-mini    | August 2025    | No earlier than April 1, 2026      |
| azure/o3              | August 2025    | No earlier than April 1, 2026      |
| azure/o4-mini         | August 2025    | No earlier than April 1, 2026      |
| gcp/claude-4.5-sonnet | September 2025 | No earlier than September 14, 2026 |
| gcp/claude-4.5-haiku  | September 2025 | No earlier than September 16, 2026 |
| gcp/gemini-2.5-pro    | August 2025    | No earlier than June 1, 2026       |
| gcp/gemini-2.5-flash  | August 2025    | No earlier than June 1, 2026       |
| aws/claude-4-sonnet   | May 2025       | No earlier than May 7, 2026        |
| aws/claude-4.5-sonnet | September 2025 | No earlier than September 14, 2026 |
| aws/claude-4.5-haiku  | September 2025 | No earlier than September 16, 2026 |

### Legacy stable models

| Model ID | Release date | Retirement date | Recommended upgrade |
| -------- | ------------ | --------------- | ------------------- |
|          |              |                 |                     |

### Retired models

| Model ID              | Release date  | Retirement date    | Recommended upgrade   |
| --------------------- | ------------- | ------------------ | --------------------- |
| gcp/gemini-1.5-pro    | December 2024 | September 15, 2025 | gemini-2.5-pro        |
| gcp/gemini-1.5-flash  | December 2024 | September 15, 2025 | gemini-2.5-flash      |
| gcp/gemini-2.0-flash  | February 2025 | September 15, 2025 | gemini-2.5-flash      |
| aws/claude-3-haiku    | December 2024 | September 15, 2025 | aws/claude-4-sonnet   |
| aws/claude-4-opus     | August 2025   | January 13, 2026   | aws/claude-4.5-sonnet |
| aws/claude-4.1-opus   | August 2025   | January 13, 2026   | aws/claude-4.5-sonnet |
| aws/claude-3.5-sonnet | December 2024 | February 15, 2026  | aws/claude-4-sonnet   |
| azure/gpt-4o          | December 2024 | March 16, 2026     | azure/gpt-4.1         |
| azure/gpt-4o-mini     | December 2024 | March 16, 2026     | azure/gpt-4.1-mini    |