LLM Comparison
GPT-5.6 Terra vs Sonar Deep Research
Side-by-side specs, pricing & capabilities · Updated September 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 70 10.1 | 25 5.1 |
| Family | GPT-5.6 | Sonar |
| Status | Current | Current |
| Release Date | Jul 2026 | Mar 2025 |
| Context Window | 1.1M tokens | 128K tokens |
| Input Price | $2.00/M tokens | $2.00/M tokens |
| Output Price | $12.00/M tokens | $8.00/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. | — |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textcode |
| Training Cutoff | Feb 16, 2026 | — |
| Max Output | 128K tokens | — |
| API Identifier | gpt-5.6-terra | perplexity/sonar-deep-research |
| 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 | 47.1perplexity |
| SciCode | 54.9769artificial-analysis | — |
| Terminal-Bench 2.1 | 88.015artificial-analysis | — |
| MMLU Pro | — | 68.9perplexity |
| MATH-500 | — | 81.7perplexity |
| AIME | — | 48.7perplexity |
| View GPT-5.6 Terra | View Sonar Deep Research | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Sonar Deep ResearchCheapest | $2.00 | $4.00 | $6.00 | — |
| GPT-5.6 Terra | $2.00 | $6.00 | $8.00 | +33% |
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.
Perplexity AI
Sonar Deep Research
Sonar Deep Research is a large language model from Perplexity AI. Supports up to 128,000 token context window. Achieves 83.0% on MMLU. Available from $2.00/M input tokens.
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