DeepSeek V4 Pro vs GPT-6.1 Sol: API pricing and agent cost
| Model | Provider | Input $/1M | Output $/1M | Cached $/1M | Per task | Per month |
|---|---|---|---|---|---|---|
| DeepSeek V4 Pro | DeepSeek | $1.32 | $3.96 | $0.044 | $0.0356 | $106.92 |
| GPT-6.1 Sol | OpenAI | $2.0 | $10.0 | $0.1 | $0.0700 | $210.00 |
For an agent making 5 tool calls per task (3,000 input and 800 output tokens per call) and running 100 tasks a day, DeepSeek V4 Pro is the cheaper option at $106.92 a month, versus $210.00 for GPT-6.1 Sol (2.0× the cost).
This compares list prices only, not quality. Peak-hour price; off-peak $0.66/$1.98. Open-weights model. Server-side Search/Fetch tool calls (e.g. via Claude Code or Codex) cost $0.75 per 1K requests starting Nov 1, 2026. Prompts with more than 272K input tokens are priced at 2x input and cache rates and 1.5x output for the full request (OpenAI model page). Derived long-context rate: $4 in / $0.20 cached / $15 out.
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