OpenAI
United StatesModel developerFirst-party API
Maker of ChatGPT and the GPT and o-series model families.
What they do
OpenAI, headquartered in San Francisco, kicked off the modern chatbot era with ChatGPT in late 2022. Its lineup spans the GPT series (through GPT-5.x, including the Terra/Sol/Luna tiers and Codex coding models), the o-series reasoning models, and the open-weight gpt-oss models released under a permissive license.
Models they develop
57 in this directory.
- GPT-3.5 TurboOpenAIOlder models
- GPT-3.5 Turbo (0613)OpenAIOlder models
- GPT-4OpenAIOlder models
- GPT-4 TurboOpenAIOlder models
- GPT-4.1OpenAIOlder models
- GPT-4.1 miniOpenAIOlder models
- GPT-4.1 nanoOpenAIOlder models
- GPT-4.5 (Preview)OpenAIOlder models
- GPT-4o (Aug '24)OpenAIOlder models
- GPT-4o (ChatGPT)OpenAIOlder models
- GPT-4o (March 2025, chatgpt-4o-latest)OpenAIOlder models
- GPT-4o (May '24)OpenAIOlder models
- GPT-4o (Nov '24)OpenAIOlder models
- GPT-4o miniOpenAISmall & local
- GPT-4o mini Realtime (Dec '24)OpenAISmall & local
- GPT-4o Realtime (Dec '24)OpenAIOlder models
- GPT-5OpenAIFrontier
- GPT-5 (ChatGPT)OpenAIFrontier
- GPT-5 CodexOpenAICoding
- GPT-5 miniOpenAISmall & local
- GPT-5 nanoOpenAISmall & local
- GPT-5.1OpenAIFrontier
- GPT-5.1 (Non-reasoning)OpenAIFrontier
- GPT-5.1 CodexOpenAICoding
- GPT-5.1 Codex miniOpenAICoding
- GPT-5.2OpenAIFrontier
- GPT-5.2 (Non-reasoning)OpenAIFrontier
- GPT-5.2 CodexOpenAICoding
- GPT-5.3 CodexOpenAICoding
- GPT-5.4OpenAIFrontier
- GPT-5.4 (Non-reasoning)OpenAIFrontier
- GPT-5.4 miniOpenAISmall & local
- GPT-5.4 mini (Non-Reasoning)OpenAISmall & local
- GPT-5.4 nanoOpenAISmall & local
- GPT-5.4 nano (Non-Reasoning)OpenAISmall & local
- GPT-5.4 ProOpenAIFrontier
- GPT-5.5OpenAIFrontier
- GPT-5.5 (Non-reasoning)OpenAIFrontier
- GPT-5.5 Instant (June 2026)OpenAIFast & cheap
- GPT-5.5 Instant (May 2026)OpenAIFast & cheap
- GPT-5.5 ProOpenAIFrontier
- GPT-5.6 LunaOpenAIFrontier
- GPT-5.6 Luna (Non-reasoning)OpenAIFrontier
- GPT-5.6 SolOpenAIFrontier
- GPT-5.6 Sol (Non-reasoning)OpenAIFrontier
- GPT-5.6 TerraOpenAIFrontier
- GPT-5.6 Terra (Non-reasoning)OpenAIFrontier
- gpt-oss-120bOpenAI120B parametersOpen weights
- gpt-oss-20bOpenAI20B parametersOpen weights
- o1OpenAIReasoning
- o1-miniOpenAIReasoning
- o1-previewOpenAIReasoning
- o1-proOpenAIReasoning
- o3OpenAIReasoning
- o3-miniOpenAIReasoning
- o3-proOpenAIReasoning
- o4-miniOpenAIReasoning