GPTNeo
GPTNeo is a model released by EleutherAI to try and provide an open source model with capabilities similar to OpenAI's GPT-3 model. One of the earliest such models, GPTNeo was trained on The Pile, Eleuther's corpus of web text.
A side-by-side comparison of release history, capabilities, licensing and model sizes.
| Attribute |
 GPTNeo
|
 Mistral
|
|---|---|---|
| Developer | EleutherAI, Together | Mistral AI |
| Current generation | – | Mistral 3 |
| Initial release | 2021-03-21 | 2023-09-27 |
| Instruct tuned | No | Yes |
| Coding | No | Yes |
| Finetuning | Yes | Yes |
| Open source | Yes | Yes |
| License | Apache 2.0 | Apache 2.0 |
| Model sizes | 1.3B, 2.7B | 3B, 8B, 14B, 675B (41B active) |
| Links |
GPTNeo is a model released by EleutherAI to try and provide an open source model with capabilities similar to OpenAI's GPT-3 model. One of the earliest such models, GPTNeo was trained on The Pile, Eleuther's corpus of web text.
Mistral is a family of efficient open and hosted models spanning edge deployment through frontier-scale multimodal workloads. Mistral 3 is the current generation.
Mistral AI launched Mistral 7B in September 2023 and followed it with the Mixtral mixture-of-experts models and hosted Small and Large tiers. Mistral 3, released in December 2025 under Apache 2.0, includes dense 3B, 8B, and 14B Ministral models plus Mistral Large 3, a 675B-parameter mixture-of-experts model with 41B active parameters. The family supports instruction tuning, reasoning variants, multilingual use, code, and image understanding.