LLM Comparison
DeepSeek V4 Pro vs GPT-5.6 Luna
Side-by-side specs, pricing & capabilities · Updated September 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 55 20.9 | 52 74.7 |
| Family | DeepSeek V4 | GPT-5.6 |
| Status | Current | Current |
| Release Date | Aug 2026 | Jul 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $1.32/M tokens | $0.20/M tokens |
| Output Price | $3.96/M tokens | $1.20/M tokens |
| Pricing Notes | DeepSeek direct API, DeepSeek-V4-Pro-0813: headline prices are peak uncached input $1.32 and output $3.96 per million tokens. Off-peak input is $0.66 and output $1.98; cache-hit input is $0.044 peak/$0.022 off-peak. Peak hours are 01:00-04:00 and 06:00-10:00 UTC Monday-Friday; all other hours are off-peak. DeepSeek has withdrawn the planned September 14, 2026 retirement and continues this API. Rates are conditional, not an unconditional off-peak offer. | OpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing. |
| Capabilities | reasoningcodingtool-usestructured-outputlong-contextagenticresponses-api | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Training Cutoff | — | Feb 16, 2026 |
| Max Output | 393K tokens | 128K tokens |
| API Identifier | deepseek-v4-pro | gpt-5.6-luna |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.1 | 44artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.1.1 | 53artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | 36.2829artificial-analysis | 37.5048artificial-analysis |
| GPQA Diamond | 92.8283artificial-analysis | 91.1111artificial-analysis |
| SciCode | 51.0417artificial-analysis | 53.588artificial-analysis |
| Terminal-Bench 2.1 | 78.6517artificial-analysis | 80.8989artificial-analysis |
| Artificial Analysis Intelligence Index | — | 51artificial-analysis |
| Artificial Analysis Coding Agent Index | — | 74.6artificial-analysis |
| View DeepSeek V4 Pro | View GPT-5.6 Luna | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 LunaCheapest | $0.20 | $0.60 | $0.80 | — |
| DeepSeek V4 Pro | $1.32 | $1.98 | $3.30 | +313% |
DeepSeek
DeepSeek V4 Pro
DeepSeek V4 Pro 0813 is an open-weight Mixture-of-Experts reasoning model for long-context coding, tool use, and agentic workloads, with native Responses API support through the DeepSeek API.
OpenAI
GPT-5.6 Luna
GPT-5.6 Luna is OpenAI lower-cost GPT-5.6 model for high-volume reasoning, coding, and agentic workloads. OpenAI model docs list the same 1.05M token context window, 128K max output, and major tool support as the larger GPT-5.6 variants.
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