Voice · best for
Best AI model for Voice Assistant Backend (2026)
Real-time voice agent backbones. Ranked from 343 live models on the OpenRouter catalog, weighted for low latency, low cost.
| # | Model | Score | In / 1M | Out / 1M | Context | |
|---|---|---|---|---|---|---|
| 1 | Google: Gemma 4 26B A4B (free)google/gemma-4-26b-a4b-it:free | 124 | Free | Free | 262,144 | Try → |
| 2 | Google: Gemma 4 31B (free)google/gemma-4-31b-it:free | 124 | Free | Free | 262,144 | Try → |
| 3 | Qwen: Qwen3.5-9Bqwen/qwen3.5-9b | 124 | $0.10 | $0.15 | 262,144 | Try → |
| 4 | Google: Gemma 4 26B A4B google/gemma-4-26b-a4b-it | 123 | $0.07 | $0.35 | 262,144 | Try → |
| 5 | Google: Gemma 4 31Bgoogle/gemma-4-31b-it | 123 | $0.13 | $0.38 | 262,144 | Try → |
| 6 | ByteDance Seed: Seed-2.0-Minibytedance-seed/seed-2.0-mini | 123 | $0.10 | $0.40 | 262,144 | Try → |
| 7 | Qwen: Qwen3.5-Flashqwen/qwen3.5-flash-02-23 | 123 | $0.07 | $0.26 | 1,000,000 | Try → |
| 8 | ByteDance Seed: Seed 1.6 Flashbytedance-seed/seed-1.6-flash | 123 | $0.07 | $0.30 | 262,144 | Try → |
| 9 | xAI: Grok 4.1 Fastx-ai/grok-4.1-fast | 123 | $0.20 | $0.50 | 2,000,000 | Try → |
| 10 | Google: Gemini 2.5 Flash Lite Preview 09-2025google/gemini-2.5-flash-lite-preview-09-2025 | 123 | $0.10 | $0.40 | 1,048,576 | Try → |
| 11 | xAI: Grok 4 Fastx-ai/grok-4-fast | 123 | $0.20 | $0.50 | 2,000,000 | Try → |
| 12 | OpenAI: GPT-5 Nanoopenai/gpt-5-nano | 123 | $0.05 | $0.40 | 400,000 | Try → |
| 13 | Google: Gemini 2.5 Flash Litegoogle/gemini-2.5-flash-lite | 123 | $0.10 | $0.40 | 1,048,576 | Try → |
| 14 | OpenAI: GPT-4.1 Nanoopenai/gpt-4.1-nano | 123 | $0.10 | $0.40 | 1,047,576 | Try → |
| 15 | Google: Gemini 2.0 Flash Litegoogle/gemini-2.0-flash-lite-001 | 123 | $0.07 | $0.30 | 1,048,576 | Try → |
How we ranked these
For Voice Assistant Backend, we weight models on low latency, low cost. Higher means better. Scores combine OpenRouter's model metadata (context length, modality support, tool calling, structured output, reasoning capability) with public pricing. See full methodology →