Best AI Models for Writing PRDs
Product requirements documents reward deep reasoning, structure, and the ability to hold a lot of context. These models rank highest for drafting and refining PRDs.
Top pick
Gemini 3.5 Flash (high)
PM Index 57.3 · $3.38/1M tok
Best value
DeepSeek V3.2 Exp (Non-reasoning)
PM Index 29.1 · $0.31/1M tok
| # | Model | PM Index | $/1M tok |
|---|---|---|---|
| 1 | Gemini 3.5 Flash (high) Google | 57.3 | $3.38 |
| 2 | GPT-5.5 (xhigh) OpenAI | 62.9 | $11.25 |
| 3 | Kimi K2.6 Kimi | 55.6 | $1.71 |
| 4 | GLM-5.1 (Reasoning) Z AI | 53.7 | $2.15 |
| 5 | GPT-5.2 (xhigh) OpenAI | 52.8 | $4.81 |
| 6 | Claude Opus 4.6 (Adaptive Reasoning, Max Effort) Anthropic | 55.4 | $10.00 |
| 7 | Grok 4.20 0309 (Reasoning) xAI | 48.4 | $3.00 |
| 8 | GPT-5.1 (high) OpenAI | 48.1 | $3.44 |
| 9 | Qwen3.5 397B A17B (Reasoning) Alibaba | 46.8 | $1.35 |
| 10 | Claude Sonnet 4.6 (Non-reasoning, High Effort) Anthropic | 48.0 | $6.00 |
| 11 | Grok 4.1 Fast (Reasoning) xAI | 40.0 | — |
| 12 | Claude Opus 4.5 (Non-reasoning) Anthropic | 46.3 | $10.00 |
| 13 | Gemini 2.5 Pro Google | 34.0 | $3.44 |
| 14 | DeepSeek V3.2 Exp (Non-reasoning) DeepSeek | 29.1 | $0.31 |
| 15 | Mistral Large 3 Mistral | 22.6 | $0.75 |
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