GPT-5.6 Sol vs GPT-5.6 Terra
GPT-5.6 Sol and GPT-5.6 Terra are both current openai production-tier models. GPT-5.6 Terra is meaningfully cheaper at $2.5 / $15 per 1M.
Specs side by side
| Metric | OpenAI GPT-5.6 Sol | OpenAI GPT-5.6 Terra |
|---|---|---|
| Input price (per 1M) | $5 | $2.5 |
| Output price (per 1M) | $30 | $15 |
| Context window | 1.1M tokens | 1.1M tokens |
| Speed tier | balanced | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose GPT-5.6 Sol if…
- You need realtime speech-to-speech
Choose GPT-5.6 Terra if…
- Cost is a priority ($2.5 / $15 per 1M vs $5 / $30 per 1M)
Benchmark delta
GPT-5.6 Sol leads on
GPT-5.6 Sol has no meaningful benchmark lead in this pair.
GPT-5.6 Terra leads on
GPT-5.6 Terra has no meaningful benchmark lead in this pair.
FAQ — GPT-5.6 Sol vs GPT-5.6 Terra
GPT-5.6 Sol vs GPT-5.6 Terra — which is better?
GPT-5.6 Sol and GPT-5.6 Terra are both current openai production-tier models. GPT-5.6 Terra is meaningfully cheaper at $2.5 / $15 per 1M. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does GPT-5.6 Sol pricing compare to GPT-5.6 Terra?
GPT-5.6 Sol costs $5 / $30 per 1M vs GPT-5.6 Terra at $2.5 / $15 per 1M. GPT-5.6 Terra is cheaper on output tokens by roughly 100%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does GPT-5.6 Sol or GPT-5.6 Terra have the bigger context window?
GPT-5.6 Terra has a 1.1M-token context window — 1× the 1.1M context of GPT-5.6 Sol. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for GPT-5.6 Sol or GPT-5.6 Terra?
GPT-5.6 Sol: no — Paid-only — no free API tier; available via ChatGPT Plus/Pro. GPT-5.6 Terra: no — Free $5 credit for new accounts; paid thereafter.
Which is better for coding — GPT-5.6 Sol or GPT-5.6 Terra?
GPT-5.6 Sol leads on coding benchmarks (GPT-5.6 Sol: 96/100, GPT-5.6 Terra: 93/100). For production coding agents also weigh tool-use performance — GPT-5.6 Sol scores 95, GPT-5.6 Terra scores 93.