Code · best for
Top picks for Regex Writing (2026)
Crafting regular expressions that actually match what you intend. Ranked from 352 live models on the OpenRouter catalog, weighted for reasoning quality, low cost.
What this is
A capability-matched shortlist, not a benchmark-tested winner. Models are scored by the fit of their declared specs (structured output, reasoning, context, modality, price) against Regex Writing. Pair with benchmark sources like Artificial Analysis or LMSys Arena before you ship. Full methodology →
| # | Model | Score | In / 1M | Out / 1M | Context | |
|---|---|---|---|---|---|---|
| 1 | Google: Gemma 4 26B A4B (free)google/gemma-4-26b-a4b-it:free | 120 | Free | Free | 262,144 | Details → |
| 2 | Google: Gemma 4 31B (free)google/gemma-4-31b-it:free | 120 | Free | Free | 262,144 | Details → |
| 3 | Qwen: Qwen3.5-9Bqwen/qwen3.5-9b | 120 | $0.10 | $0.15 | 262,144 | Details → |
| 4 | Google: Gemma 4 26B A4B google/gemma-4-26b-a4b-it | 119 | $0.06 | $0.33 | 262,144 | Details → |
| 5 | Google: Gemma 4 31Bgoogle/gemma-4-31b-it | 119 | $0.13 | $0.38 | 262,144 | Details → |
| 6 | ByteDance Seed: Seed-2.0-Minibytedance-seed/seed-2.0-mini | 119 | $0.10 | $0.40 | 262,144 | Details → |
| 7 | Qwen: Qwen3.5-Flashqwen/qwen3.5-flash-02-23 | 119 | $0.07 | $0.26 | 1,000,000 | Details → |
| 8 | ByteDance Seed: Seed 1.6 Flashbytedance-seed/seed-1.6-flash | 119 | $0.07 | $0.30 | 262,144 | Details → |
| 9 | xAI: Grok 4.1 Fastx-ai/grok-4.1-fast | 119 | $0.20 | $0.50 | 2,000,000 | Details → |
| 10 | Google: Gemini 2.5 Flash Lite Preview 09-2025google/gemini-2.5-flash-lite-preview-09-2025 | 119 | $0.10 | $0.40 | 1,048,576 | Details → |
| 11 | xAI: Grok 4 Fastx-ai/grok-4-fast | 119 | $0.20 | $0.50 | 2,000,000 | Details → |
| 12 | OpenAI: GPT-5 Nanoopenai/gpt-5-nano | 119 | $0.05 | $0.40 | 400,000 | Details → |
| 13 | Google: Gemini 2.5 Flash Litegoogle/gemini-2.5-flash-lite | 119 | $0.10 | $0.40 | 1,048,576 | Details → |
| 14 | NVIDIA: Nemotron 3 Nano 30B A3Bnvidia/nemotron-3-nano-30b-a3b | 119 | $0.05 | $0.20 | 262,144 | Details → |
| 15 | Mistral: Mistral Small 4mistralai/mistral-small-2603 | 119 | $0.15 | $0.60 | 262,144 | Details → |
How we ranked these
For Regex Writing, we weight models on reasoning quality, low cost. Higher means better. Scores combine each model's public metadata (context length, modality support, tool calling, structured output, reasoning capability) with live pricing. See full methodology →
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