OpenAI
OpenAI is the company that launched the modern AI era with ChatGPT in November 2022. On June 26, 2026 it previewed GPT-5.6 as a three-model family (Sol, Terra, Luna) under a US Government limited-preview arrangement that restricted day-one access to roughly 20 pre-approved organizations, with general availability planned in the weeks that follow. Sol sits at the frontier at $5 per 1M input and $30 per 1M output, Terra targets GPT-5.5-class performance at half the cost ($2.50 / $15), and Luna fills the budget tier at $1 / $6. GPT-5.5 (April 2026) remains the broadly available flagship, with a 1M context window and the same $5 / $30 pricing as Sol. GPT-4.5 was removed from ChatGPT on June 26, 2026, following GPT-5.2 Instant, Thinking, and Pro on June 12, tightening the active ChatGPT lineup around GPT-5.5. OpenAI operates the largest AI developer ecosystem with broad third-party integrations, plugins, and the most recognizable consumer AI brand in the world.
Service status
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Founded
2015
Headquarters
San Francisco, CA
CEO
Sam Altman
Models
8 active
Key Products
Strengths
- ✓Largest developer ecosystem
- ✓GPT-5.6 family in limited preview from June 26, 2026
- ✓Native audio support in GPT-4o
- ✓Strong reasoning models (o1, o3)
- ✓Consumer brand recognition
- ✓Broad enterprise partnerships
OpenAI Models
| Model | Input / 1M | Output / 1M | Context | Capabilities |
|---|---|---|---|---|
| GPT-5.6 Sol | 5.00 | 30.00 | 1M | text, vision, tool-use, code, reasoning |
| GPT-5.6 Terra | 2.50 | 15.00 | 1M | text, vision, tool-use, code, reasoning |
| GPT-5.6 Luna | 1.00 | 6.00 | 1M | text, vision, tool-use, code, reasoning |
| GPT-5.5 | 5.00 | 30.00 | 1M | text, vision, tool-use, code, reasoning |
| GPT-4o | 2.50 | 10.00 | 128K | text, vision, tool-use, code |
| GPT-4o-mini | 0.15 | 0.60 | 128K | text, vision, tool-use, code |
| o1 | 15.00 | 60.00 | 200K | text, reasoning, code |
| o3-mini | 1.10 | 4.40 | 200K | text, reasoning, code |
Prices per 1M tokens in USD. See the full pricing guide for detailed analysis.
Benchmark Scores
| Model | SWE-bench | MMLU-Pro | HumanEval | GPQA Diamond | MATH |
|---|---|---|---|---|---|
| GPT-5.5 | 82.6 | 94.2 | 97.1 | 78.3 | 95.8 |
| GPT-4o | 33.2 | 87.2 | 90.2 | 59.1 | 81.3 |
| GPT-4.5 | 38.0 | 90.1 | 93.4 | 68.7 | 88.2 |
| o1 | 48.9 | 91.8 | 94.2 | 72.5 | 94.6 |
| o3-mini | 49.3 | 86.3 | 89.7 | 60.3 | 87.1 |
Comparisons
Claude Opus 4.7 vs GPT-4o
Anthropic vs OpenAI
GPT-4o vs Gemini 2.5 Pro
OpenAI vs Google
GPT-4o vs Claude Sonnet 4.6
OpenAI vs Anthropic
Gemini 2.0 Flash vs GPT-4o Mini
Google vs OpenAI
GPT-5.5 vs Claude Opus 4.7
OpenAI vs Anthropic
GPT-5.5 vs Gemini 2.5 Pro
OpenAI vs Google
DeepSeek V4 Pro vs GPT-5.5
DeepSeek vs OpenAI
o3-mini vs Claude Sonnet 4.6
OpenAI vs Anthropic
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