LLM Comparison
GPT-5.6 Terra vs Palmyra X5
Side-by-side specs, pricing & capabilities · Updated October 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 71 10.2 | |
| Family | GPT-5.6 | Palmyra |
| Status | Current | Current |
| Release Date | Jul 2026 | Jan 2026 |
| Context Window | 1.1M tokens | 1.0M tokens |
| Input Price | $2.00/M tokens | $0.60/M tokens |
| Output Price | $12.00/M tokens | $6.00/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. | Writer direct API Palmyra X5: $0.60 input and $6.00 output per million tokens. Writer Agent bills X5 at $5.00 input and $12.00 output per million; Amazon Bedrock pricing is separate. |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textcode |
| Training Cutoff | Feb 16, 2026 | — |
| Max Output | 128K tokens | 8K tokens |
| API Identifier | gpt-5.6-terra | writer/palmyra-x5 |
| 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 | — |
| View GPT-5.6 Terra | View Palmyra X5 | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Palmyra X5Cheapest | $0.60 | $3.00 | $3.60 | — |
| GPT-5.6 Terra | $2.00 | $6.00 | $8.00 | +122% |
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.
Writer
Palmyra X5
Palmyra X5 is Writer's general-purpose AI model with a 1-million-token context window and an 8,192-token output limit. Writer lists direct API pricing of $0.60 input and $6.00 output per million tokens; X5 is scheduled for deprecation on December 14, 2026.
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