GPT Sol vs GPT Terra
Two OpenAI generations with the same million-token context. Sol has moved to GPT-6.1 at $2 and $10 per million tokens, while Terra stays on GPT-5.6 and no longer appears on OpenAI's main pricing page. Check Terra's current rate before picking it to save money; on the prices OpenAI lists today, Sol is the default.
| GPT Sol | GPT Terra | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Current release | GPT-6.1 Sol | GPT-5.6 Terra |
| Tier | Frontier | Balanced |
| Context | 1M | 1M |
| Cost | Moderate | Moderate |
| Modalities | text, vision | text, vision |
| Open weights | No | No |
Cost is a tier, not a quote, providers change prices often. Check OpenAI and OpenAI before you commit. Last updated 2026-10-21.
Which one to pick
GPT SolOpenAI · GPT-6.1 Sol
Frontier-grade generalist work now that Astra has taken the top of the line
Reach for it when- Problems where the extra capability changes the outcome
- Research-grade or scientific reasoning
GPT TerraOpenAI · GPT-5.6 Terra
Production workloads that need frontier-family quality without the flagship bill
Reach for it when- Workloads validated on GPT-5.6 that have not migrated
- Existing deployments tied to Terra's specific behavior
Related comparisons
- GPT Astra vs GPT SolThe within-OpenAI upgrade question.
- Claude Opus vs GPT SolTwo mid-frontier models, now that GPT-6 Astra sits above Sol and Claude Fable 5.1 sits above Opus.
- GPT Sol vs Gemini ProSol is the stronger all-round generalist; Gemini 3.1 Pro is the reasoning-benchmark leader at a comparable price, $2 and $12 against Sol's $2 and $10.
- GPT Sol vs GrokSol is the safer default and scores higher overall; Grok 4.7 matches it on some agentic work at lower output cost, $2 and $6 against $2 and $10.
- Claude Sonnet vs GPT TerraThe workhorse tier, where most production traffic actually runs.
- GPT Sol vs KimiThe open-versus-closed question at the top of the market.