# Together AI — DeepSeek V4 Pro 0813 vs GPT-5.6 Sol on DeepSWE: Cost, Coding, and Routing

- Company: Together AI (together.ai)
- Announced: 2026-08-18T00:00:00+00:00
- Subject: Inference platform
- Models affected: DeepSeek V4 Pro 0813, GPT-5.6 Sol
- Pricing: At $0.24 a rollout, DeepSeek V4 Pro 0813 is 35x cheaper than Sol ($8.37)
- Source: https://www.together.ai/blog/deepseek-v4-pro-0813-vs-gpt-5-6-sol-on-deepswe-cost-coding-and-routing
- Record: https://forck.live/items/4158-deepseek-v4-pro-0813-vs-gpt-5-6-sol-on-deepswe-cost-coding-and-routing

The post compares DeepSeek V4 Pro 0813 and GPT-5.6 Sol on the DeepSWE benchmark. GPT-5.6 Sol has higher single-shot accuracy (72.7% pass@1 vs 62.8%) but is 35x more expensive ($8.37 per rollout vs $0.24). The cheaper model DeepSeek V4 Pro 0813 matches or exceeds Sol's accuracy with multiple attempts (88.5% pass@4 vs 85.8%). A cascade strategy—using DeepSeek V4 Pro 0813 first and escalating to GPT-5.6 Sol on failure—solves 83.0% of tasks at $3.35 each, outperforming either model alone in cost-efficiency.

## Evidence

Verbatim from https://www.together.ai/blog/deepseek-v4-pro-0813-vs-gpt-5-6-sol-on-deepswe-cost-coding-and-routing:

> Don't pick one. Run DeepSeek V4 Pro 0813 first, escalate to GPT-5.6 Sol when the tests fail. That cascade solves 83.0% of DeepSWE tasks at $3.35 each.

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