GPT 5.4 Nano High
OpenAI
Key facts · verified Oct 29, 2026
GPT 5.4 Nano High is an OpenAI model released on 17 Mar 2026. Status: Deprecated - shutting down 1 April 2027; replacement: gpt-6-luna. Its API price is $0.20 per million input tokens and $1.25 per million output tokens. Its context window is 400K tokens. It ranks #164 on LMArena's text leaderboard (Elo 1401, read 2 Nov 2026). Source: developers.openai.com.
GPT 5.4 Nano High is OpenAI's GPT-5.4 nano model run at high reasoning effort. It is listed at $0.20 per million input tokens and $1.25 per million output tokens, with a 400K-token context window. OpenAI's deprecations page lists gpt-5.4-nano for shutdown on 1 April 2027, with gpt-6-luna as the replacement. On LMArena's text leaderboard it has 1401 Elo (rank 164, high effort).
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1401 Elo (rank 164, high effort) · source · retrieved Nov 2, 2026
Full Specifications
$0.20 / $1.25 per million tokens | |
|---|---|
| Identity | |
| Developer | OpenAI |
| Released | Mar 2026 |
| Status | Deprecated - shutting down 1 April 2027; replacement: gpt-6-luna |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $0.463 / 1M tokens |
| Input price | $0.200 / 1M tokens |
| Output price | $1.250 / 1M tokens |
| Capacity | |
| Context window | 400K tokens |
| Measured quality | |
| LMArena Elo | 1401 (checked Nov 2026) |
| LMArena rank | Rank 164 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 3029 |