GPT-5.5 Instant
| Released | 2026-05-05 |
|---|---|
| Price per 1M | $5.00 in · $30.00 out |
| Overall score | 54.5 · rank 79 |
| Context window | 400,000 tokens |
| Provider | OpenAI |
| Weights | Proprietary |
Scores
| Dimension | Score | Rank | Benchmarks |
|---|---|---|---|
| Overall: Balanced | 54.5 | 79 | 8 |
| Overall: Coding | 56.0 | 62 | 3 |
| Overall: Reasoning | 48.7 | 125 | 5 |
| Overall: Agentic work | 53.8 | 84 | 3 |
| Overall: Frontend | 58.0 | 39 | 2 |
| Coding | 57.6 | 52 | 1 |
| Reasoning | 47.4 | 133 | 2 |
| Math | 50.4 | 107 | 3 |
| General | 58.9 | 36 | 1 |
| Multimodal | 59.3 | 23 | 1 |
| Value vs price | −0.5 | 124 |
Evidence
Coding 57.6 ±4.7
Reasoning 47.4 ±3.5
| Benchmark | Result | Source | Date |
|---|---|---|---|
| GPQA Diamond | 82.5% | Epoch AI | 2026-08-02 |
| CritPt | 0.0% | Epoch AI | 2026-11-11 |
Math 50.4 ±2.0
| Benchmark | Result | Source | Date |
|---|---|---|---|
| FrontierMath Tiers 1-3 | 26.3% | Epoch AI | 2026-08-02 |
| FrontierMath Tier 4 | 2.4% | Epoch AI | 2026-08-02 |
| OTIS Mock AIME 2024-2025 | 68.1% | Epoch AI | 2026-08-02 |
General 58.9 ±4.1
| Benchmark | Result | Source | Date |
|---|---|---|---|
| LMArena Text | 1,473 | LMArena | 2026-11-09 |
Multimodal 59.3 ±4.1
| Benchmark | Result | Source | Date |
|---|---|---|---|
| LMArena Vision | 1,277 | LMArena | 2026-11-09 |
Names matched to this model
gpt-5-5-instant