GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...
OpenAI: GPT-5.4 — OpenAI. Context window 1,050,000 tokens. API pricing (per 1M tokens): Input $2.5, Output $15. License: Proprietary. LMArena 1,469. GPQA Diamond 93.3%.
| Provider | OpenAI |
|---|---|
| API model ID | openai/gpt-5.4 |
| Tier | Frontier |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $2.5 |
| API pricing (per 1M tokens) · Output | $15 |
| LMArena | 1,469 (gpt-5.4-high) |
| GPQA Diamond | 93.3% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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