GPT-5.1 Medium vs GPT-5.4 nano: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Medium | GPT-5.4 nano |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | November 11, 2025 | March 1, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 256K | 400K |
| Context (output) | 64K | 128K |
| Input Price / 1M | $1.00 | $0.12 |
| Output Price / 1M | $4.00 | $1.50 |
| Average Score | 1.0 | 0.7 |
Verdict
GPT-5.4 nano leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Medium — 1.0, GPT-5.4 nano — 0.7.
API Cost
GPT-5.4 nano is 3.1x cheaper: input $0.12/1M vs $1.00/1M tokens.
Context Window
GPT-5.4 nano supports a larger context: 400K vs 256K tokens.
Recency
GPT-5.4 nano is newer: released 3/1/2026 vs 11/11/2025.
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The GPT-5.1 Medium and GPT-5.4 nano comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Medium or GPT-5.4 nano page. See also the complete list of AI model comparisons.