OpenAIGPT-5.6
GPT-5.6 is an OpenAI proprietary reasoning model, released 9 Jul 2026. It is not yet ranked: 1 independent result so far, and the index needs at least five across two categories. At $8.00 per million tokens blended it is among the most expensive ranked models. Last measured 15 Jul 2026.
- Blended price
- $8.00/M
- $4.00 in · $20.00 out
- Output speed
- –
- First answer
- –
- Context
- 1.1M
- Full answer
- –
- Cost per run
- –
- Released
- 9 Jul 2026
- Agents & tools62
Versions
OpenAI has shipped 13 models under this name. Each is ranked on its own results; a newer version often has fewer results so far, which holds its index nearer the average until more arrive.
| Model | Released | Index | Rank |
|---|---|---|---|
| GPT-5.6this page | 9 Jul 2026 | – | – |
| GPT-5.5xhigh | 23 Apr 2026 | 66.1 | #35 |
| GPT-5.4xhigh | 5 Mar 2026 | 64.7 | #45 |
| GPT-5.2xhigh | 11 Dec 2025 | 60.7 | #104 |
| GPT-5.1high | 12 Nov 2025 | 57.7 | #170 |
| GPT-5high | 7 Aug 2025 | 57.9 | #165 |
| GPT-4.1 | 14 Apr 2025 | 48.3 | #429 |
| GPT-4.5 | 27 Feb 2025 | 49.7 | #388 |
| GPT 4 0125 | 25 Jan 2024 | – | – |
| GPT-4 1106 | 6 Nov 2023 | – | – |
| GPT 4 0613 | 13 Jun 2023 | 39.7 | #677 |
| GPT-4 | 14 Mar 2023 | 42.4 | #596 |
| GPT-3.5 | – | – | – |
Benchmark results
See all LLM benchmarks. One column per reasoning effort. Rank is among every configuration of every model on that benchmark. Hover a score for the run it came from.
Agents & tools
| Benchmark | not stated | Source |
|---|---|---|
| MCP Atlas | 81.8%#11 | Scale AI SEAL |
What a task costs
Estimates from list price, output speed and time to first answer for the best configuration. “With caching” assumes three-quarters of the input is served from the prompt cache at $0.400 per 1M. Reasoning tokens are not modelled.
| Workload | Tokens in / out | Cost | With caching | Time |
|---|---|---|---|---|
| Chat reply | 400 / 300 | $0.0076 | $0.0065 | – |
| Summarize a 30-page report | 12,000 / 600 | $0.060 | $0.028 | – |
| Code edit | 6,000 / 1,500 | $0.054 | $0.038 | – |
| Agentic coding session | 60,000 / 4,000 | $0.320 | $0.158 | – |
| Structured extraction | 2,000 / 200 | $0.012 | $0.0066 | – |
More from OpenAI
See also
Questions people ask
- Why does GPT-5.6 have no BenchLeader Index score?
- The index needs at least five independent results across at least two categories; as of 24 Oct 2026 GPT-5.6 has 1 that count. Launch-post scores are never used, so it is ranked once independent publishers have measured it.
- How much does GPT-5.6 cost per 1M tokens?
- As of 24 Oct 2026, GPT-5.6 costs $4.00 per 1M input tokens and $20.00 per 1M output tokens, $8.00 blended (three input tokens per output token).
- When was GPT-5.6 released?
- OpenAI released GPT-5.6 on 9 Jul 2026.
Data as of 24 Oct 2026. Compare with another model.
Cite as: BenchLeader, “GPT-5.6: benchmarks, pricing, speed and rank”, data as of 24 Oct 2026, https://www.benchleader.com/models/gpt-5-6.