GPT-5 Medium vs GPT-5.1 Instant: Specs & Benchmark Comparison
| Characteristic | GPT-5 Medium | GPT-5.1 Instant |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | August 6, 2025 | November 11, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 256K |
| Context (output) | 64K | 32K |
| Input Price / 1M | $0.75 | $0.30 |
| Output Price / 1M | $3.00 | $1.20 |
| Average Score | 0.9 | 0.9 |
| Benchmarks | ||
| AIME 2025 | 0.9 | 0.9 |
| GPQA | 0.9 | 0.9 |
Visual Benchmark Comparison
GPT-5 Medium
GPT-5.1 Instant
AIME 20250.9 vs 0.9
0.9
0.9
GPQA0.9 vs 0.9
0.9
0.9
Verdict
GPT-5.1 Instant leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5 Medium — 0.9, GPT-5.1 Instant — 0.9.
API Cost
GPT-5.1 Instant is 2.5x cheaper: input $0.30/1M vs $0.75/1M tokens.
Context Window
GPT-5 Medium supports a larger context: 400K vs 256K tokens.
Recency
GPT-5.1 Instant is newer: released 11/11/2025 vs 8/6/2025.
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The GPT-5 Medium and GPT-5.1 Instant 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 Medium or GPT-5.1 Instant page. See also the complete list of AI model comparisons.