GPT-5.6 Sol vs GPT-5.6 Terra
Side-by-side comparison. Updated 2026-07-09.
Summary
Compare GPT-5.6 Sol and GPT-5.6 Terra across pricing, context window, modalities, strengths, weaknesses, and best-fit workloads.
Use the details below to weigh cost, context, modalities, and workload fit.
At a Glance
| Attribute | GPT-5.6 Sol | GPT-5.6 Terra |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | Agentic Coding Intelligent Long Context Reasoning | Intelligent Coding Agentic |
| Context | 1,050,000 tokens | 1,050,000 tokens |
| Input price | $5.00/1M | $2.50/1M |
| Output price | $30.00/1M | $15.00/1M |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
GPT-5.6 Sol Strengths
- Terminal-Bench 2.1 SOTA (91.9% in Ultra mode)
- Ultra multi-agent mode coordinates parallel sub-agents for complex tasks
- 1.05M-token context for long-horizon agentic work
- Max reasoning-effort control for deeper single-pass reasoning
- New predictable prompt-caching with explicit cache controls
GPT-5.6 Terra Strengths
- GPT-5.5-competitive quality at ~2x lower cost than Sol
- 1.05M-token context at a mid-tier price
- Strong general-purpose coding and agentic baseline
- Replaces GPT-5.4 as the balanced default workhorse