LLM Comparison
GPT-5.6 Terra vs GPT-6.1 Sol
Side-by-side specs, pricing & capabilities · Updated September 2026
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2/6 models| Organization | ||
| OpenTools Score | 71 10.2 | |
| Family | GPT-5.6 | GPT-6.1 |
| Status | Current | Current |
| Release Date | Jul 2026 | Sep 2026 |
| Context Window | 1.1M tokens | 1.1M tokens |
| Input Price | $2.00/M tokens | $2.00/M tokens |
| Output Price | $12.00/M tokens | $10.00/M tokens |
| Pricing Notes | OpenAI pricing page lists $2.50 input and $15 output per 1M tokens, with GPT-5.6 cache-write and cache-read pricing. | OpenAI Standard API, USD per million tokens for prompts with at most 272K input tokens: $2 input, $0.10 cached input, $2.50 cache writes, $10 output. Above 272K input, 2x input/cache and 1.5x output apply to the entire request. Fast mode is 2x Standard (not available with EU data residency); Batch and Flex are 50% below Standard. Regional processing adds 10% where available. Reasoning output tokens are billed as output. The maximum input limit is 922K tokens. |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textvisionreasoningcodingtool-usecomputer-uselong-contextcontext-caching |
| Training Cutoff | Feb 16, 2026 | 2026-04-30 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | gpt-5.6-terra | gpt-6.1-sol |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 55artificial-analysis | — |
| Artificial Analysis Coding Agent Index | 77.4artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | 42.2515artificial-analysis | — |
| GPQA Diamond | 92.5253artificial-analysis | — |
| SciCode | 54.9769artificial-analysis | — |
| Terminal-Bench 2.1 | 88.015artificial-analysis | — |
| HealthBench Professional length-adjusted | — | 64.2openai |
| HealthBench length-adjusted | — | 58.5openai |
| HealthBench Hard length-adjusted | — | 36.2openai |
| HealthBench Consensus length-adjusted | — | 96openai |
| View GPT-5.6 Terra | View GPT-6.1 Sol | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-6.1 SolCheapest | $2.00 | $5.00 | $7.00 | — |
| GPT-5.6 Terra | $2.00 | $6.00 | $8.00 | +14% |
OpenAI
GPT-5.6 Terra
GPT-5.6 Terra is OpenAI balanced GPT-5.6 model for teams that need strong reasoning and agentic performance at lower cost than Sol. OpenAI model docs list a 1.05M token context window, 128K max output, and support for functions, web search, file search, and computer use.
OpenAI
GPT-6.1 Sol
GPT-6.1 Sol is OpenAI's proprietary reasoning model for coding, computer use, and professional workflows. The gpt-6.1-sol API model accepts text and images and returns text. OpenAI documents a 1,050,000-token context window, 922,000 maximum input tokens, and 128,000 maximum output tokens. OpenAI's system card reports first-party HealthBench results; no exact independent Artificial Analysis result was available at the observed time.
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