Best LLMs for Retrieval-Augmented Generation (2026)
Compare models for RAG, document QA, retrieval-heavy assistants, and long-context grounding by context window, document benchmarks, tool support, and pricing.
| # | Model | Input $/1M | Output $/1M | |
|---|---|---|---|---|
| 1 | Grok 4.20 ReasoningTools RULER: — | $1.25 | $2.50 | |
| 2 | Grok 4.20 Multi-Agent ReasoningTools RULER: — | $1.25 | $2.50 | |
| 3 | GPT-5.5 ReasoningVisionTools RULER: — | $5.00 | $30.00 | |
| 4 | GPT-5.5 Pro ReasoningVisionTools RULER: — | $30.00 | $180.00 | |
| 5 | GPT-5.4 ReasoningTools RULER: — | $2.50 | $15.00 | |
| 6 | GPT-5.4 Pro ReasoningVisionTools RULER: — | $30.00 | $180.00 | |
| 7 | Gemini 3.1 Flash-Lite VisionTools RULER: — | $0.25 | $1.50 | |
| 8 | Xiaomi MiMo-V2.5-Pro Tools RULER: — | $1.00 | $3.00 | |
| 9 | Xiaomi MiMo-V2.5 ReasoningVisionTools RULER: — | $0.40 | $2.00 | |
| 10 | Nemotron 3 Super-120B-A12B RULER: — | $0.09 | $0.45 | |
| 11 | Gemini 2.5 Pro Computer Use Preview VisionTools RULER: — | $1.25 | $10.00 | |
| 12 | GPT-4.1 VisionTools RULER: — | $2.00 | $8.00 | |
| 13 | GPT-4.1 Mini VisionTools RULER: — | $0.40 | $1.60 | |
| 14 | Grok 4.3 ReasoningVisionTools RULER: — | $1.25 | $2.50 | |
| 15 | DeepSeek V4 Flash ReasoningTools RULER: — | $0.14 | $0.28 | |
| 16 | DeepSeek V4 Pro ReasoningTools RULER: — | $0.43 | $0.87 | |
| 17 | Claude Opus 4.7 ReasoningVisionTools RULER: — | $5.00 | $25.00 | |
| 18 | Qwen3.6-Plus VisionTools RULER: — | $0.33 | $1.95 | |
| 19 | GPT-5.4 Mini ReasoningTools RULER: — | $0.75 | $4.50 | |
| 20 | GPT-5.4 Nano Tools RULER: — | $0.20 | $1.25 |
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