GPT-5.6 Sol
Active Parameters
Undisclosed
Context Length
1.05M
Modality
Multimodal
Architecture
Mixture of Experts (MoE)
License
Proprietary
Release Date
9 Jul 2026
Knowledge Cutoff
Feb 2026
API Pricing (per 1M)
Input: $4.00 · Output: $20.00
Evaluation Benchmarks
Rank
#9
| Benchmark | Score | Rank |
|---|---|---|
Graduate-Level QA | 0.946 | 🥈 2 |
Coding Index | max 0.78 high 0.77 medium 0.76 low 0.70 Standard 0.65 | 🥉 3 5 15 46 59 |
Coding | max 0.84 | 5 |
Reasoning | max 0.92 | 5 |
Mathematics | max 0.96 | 7 |
General | max 0.81 | 8 |
Data Analysis | max 0.80 | 8 |
LiveBench Average | max 0.81 | 8 |
Agent Arena | max 0.06 | 10 |
General Text | max 1485 | 17 |
Intelligence Index | max 0.47 high 0.42 medium 0.39 low 0.34 Standard 0.28 | 19 37 56 86 111 |
Agentic Index | max 0.50 high 0.44 medium 0.40 low 0.32 Standard 0.28 | 19 30 44 61 68 |
Web Development | max 1618 | 23 |
Agentic Coding | max 0.56 | 26 |
Rankings
Overall Rank
#9
Coding Rank
#9
About GPT-5.6 Sol
OpenAI's flagship GPT-5.6 Sol delivers frontier capabilities in agentic coding, cybersecurity, and complex multi-step reasoning with subagent orchestration in ultra mode.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
Resources
About GPT-5.6
OpenAI's GPT-5.6 series represents the next-generation frontier intelligence family structured into three tiered variants: Sol (flagship reasoning and autonomous agents), Terra (balanced everyday production workhorse), and Luna (lightweight, ultrafast, cost-effective inference). It introduces new max and ultra (sub-agent coordination) reasoning modes, native programmatic tool calling, a 1M token context window with 128k output tokens, and a February 16, 2026 knowledge cutoff.