Best AI Tools for Code Migration and Refactoring (2026)
Migrating between frameworks, upgrading dependencies, or refactoring legacy code? These AI models handle large-scale code transformations.
Quick Recommendations
Our top 3 picks for this use case, ranked by value.
Gemini 2.5 Flash Lite
The most affordable Gemini model. Ultra-low cost for high-volume, simple coding and text tasks.
View Full Pricing →Mistral Nemo
Compact 12B open-weight model co-developed with NVIDIA. Excellent coding performance at minimal cost.
View Full Pricing →Why These Models?
Code migration and refactoring are among the most demanding tasks for AI coding tools. You need models that can understand large codebases, preserve functionality while changing structure, and handle framework-specific migration patterns.
Large context windows are critical here. Gemini 2.5 Pro (1M tokens) can analyze entire codebases for migration planning. For actual code transformation, Claude Sonnet 4 and GPT-4o produce the most reliable migration code. Claude Opus 4 handles the most complex refactoring scenarios.
Complete Rankings & Pricing
All 44 models ranked for best ai coding tool for code migration refactoring. Costs calculated at 30% cache hit rate.
| Rank | Model | Provider | Small Project | Medium Project | Large Project | Code Review | Compare |
|---|---|---|---|---|---|---|---|
| #1 | Gemini 2.5 Flash Lite | <$0.01 | $0.04 | $0.22 | $0.01 | vs Gemini 2.5 Flash Lite | |
| #2 | Qwen Turbo | Qwen | $0.01 | $0.08 | $0.38 | $0.02 | vs Gemini 2.5 Flash Lite |
| #3 | Mistral Nemo | Mistral | <$0.01 | $0.08 | $0.41 | $0.03 | vs Gemini 2.5 Flash Lite |
| #4 | Gemini 1.5 Flash | $0.01 | $0.09 | $0.43 | $0.02 | vs Gemini 2.5 Flash Lite | |
| #5 | Microsoft Phi-4 | Microsoft | $0.01 | $0.10 | $0.47 | $0.02 | vs Gemini 2.5 Flash Lite |
| #6 | Gemini 2.0 Flash | $0.02 | $0.12 | $0.58 | $0.03 | vs Gemini 2.5 Flash Lite | |
| #7 | Gemma 3 27B | $0.02 | $0.12 | $0.58 | $0.03 | vs Gemini 2.5 Flash Lite | |
| #8 | Gemini 2.5 Flash | $0.02 | $0.17 | $0.86 | $0.04 | vs Gemini 2.5 Flash Lite | |
| #9 | Codestral | Mistral | $0.04 | $0.29 | $1.43 | $0.07 | vs Gemini 2.5 Flash Lite |
| #10 | Llama 3.3 70B | Meta | $0.04 | $0.29 | $1.44 | $0.07 | vs Gemini 2.5 Flash Lite |
| #11 | DeepSeek Coder V2 | DeepSeek | $0.04 | $0.31 | $1.57 | $0.07 | vs Gemini 2.5 Flash Lite |
| #12 | DeepSeek Coder V3 | DeepSeek | $0.04 | $0.31 | $1.57 | $0.07 | vs Gemini 2.5 Flash Lite |
| #13 | Claude 3 Haiku | Anthropic | $0.05 | $0.34 | $1.69 | $0.07 | vs Gemini 2.5 Flash Lite |
| #14 | Qwen Coder Turbo | Qwen | $0.05 | $0.34 | $1.69 | $0.07 | vs Gemini 2.5 Flash Lite |
| #15 | Qwen Coder Turbo V2 | Qwen | $0.05 | $0.34 | $1.73 | $0.08 | vs Gemini 2.5 Flash Lite |
| #16 | GPT-4.1 mini | OpenAI | $0.06 | $0.46 | $2.30 | $0.11 | vs Gemini 2.5 Flash Lite |
| #17 | Mistral Medium | Mistral | $0.07 | $0.54 | $2.70 | $0.12 | vs Gemini 2.5 Flash Lite |
| #18 | Qwen 3 Coder | Qwen | $0.08 | $0.57 | $2.88 | $0.14 | vs Gemini 2.5 Flash Lite |
| #19 | Qwen Coder Plus | Qwen | $0.15 | $1.08 | $5.40 | $0.24 | vs Gemini 2.5 Flash Lite |
| #20 | Claude 3.5 Haiku | Anthropic | $0.16 | $1.24 | $6.21 | $0.32 | vs Gemini 2.5 Flash Lite |
| #21 | Claude 4 Haiku | Anthropic | $0.16 | $1.24 | $6.21 | $0.32 | vs Gemini 2.5 Flash Lite |
| #22 | OpenAI o3-mini | OpenAI | $0.17 | $1.27 | $6.33 | $0.30 | vs Gemini 2.5 Flash Lite |
| #23 | OpenAI o4-mini | OpenAI | $0.17 | $1.27 | $6.33 | $0.30 | vs Gemini 2.5 Flash Lite |
| #24 | Gemini 1.5 Pro | $0.19 | $1.44 | $7.19 | $0.34 | vs Gemini 2.5 Flash Lite | |
| #25 | Claude Sonnet 4 Lite | Anthropic | $0.21 | $1.55 | $7.76 | $0.40 | vs Gemini 2.5 Flash Lite |
| #26 | Mistral Large 3 | Mistral | $0.25 | $1.90 | $9.50 | $0.50 | vs Gemini 2.5 Flash Lite |
| #27 | Grok Code | xAI | $0.28 | $2.02 | $10.13 | $0.45 | vs Gemini 2.5 Flash Lite |
| #28 | GPT-4.1 | OpenAI | $0.31 | $2.30 | $11.50 | $0.55 | vs Gemini 2.5 Flash Lite |
| #29 | Gemini 2.5 Pro | $0.34 | $2.44 | $12.19 | $0.47 | vs Gemini 2.5 Flash Lite | |
| #30 | Gemini 2.0 Pro | $0.39 | $2.88 | $14.38 | $0.69 | vs Gemini 2.5 Flash Lite | |
| #31 | GPT-4o | OpenAI | $0.41 | $3.06 | $15.31 | $0.78 | vs Gemini 2.5 Flash Lite |
| #32 | Claude 3 Sonnet | Anthropic | $0.55 | $4.05 | $20.25 | $0.90 | vs Gemini 2.5 Flash Lite |
| #33 | Grok 3 | xAI | $0.55 | $4.05 | $20.25 | $0.90 | vs Gemini 2.5 Flash Lite |
| #34 | Claude Sonnet 4 | Anthropic | $0.62 | $4.66 | $23.29 | $1.20 | vs Gemini 2.5 Flash Lite |
| #35 | Claude 3.5 Sonnet | Anthropic | $0.62 | $4.66 | $23.29 | $1.20 | vs Gemini 2.5 Flash Lite |
| #36 | Qwen 3.6 Plus | Qwen | $0.62 | $4.66 | $23.29 | $1.20 | vs Gemini 2.5 Flash Lite |
| #37 | Qwen 3 Max | Qwen | $0.78 | $5.75 | $28.75 | $1.38 | vs Gemini 2.5 Flash Lite |
| #38 | Grok 4 | xAI | $0.93 | $6.75 | $33.75 | $1.50 | vs Gemini 2.5 Flash Lite |
| #39 | OpenAI o3 | OpenAI | $1.55 | $11.50 | $57.50 | $2.75 | vs Gemini 2.5 Flash Lite |
| #40 | OpenAI o1 | OpenAI | $2.32 | $17.25 | $86.25 | $4.13 | vs Gemini 2.5 Flash Lite |
| #41 | Claude 3 Opus | Anthropic | $2.77 | $20.25 | $101.25 | $4.50 | vs Gemini 2.5 Flash Lite |
| #42 | OpenAI o1 Pro | OpenAI | $3.10 | $23.00 | $115.00 | $5.50 | vs Gemini 2.5 Flash Lite |
| #43 | OpenAI o3 Pro | OpenAI | $3.10 | $23.00 | $115.00 | $5.50 | vs Gemini 2.5 Flash Lite |
| #44 | Claude Opus 4 | Anthropic | $3.08 | $23.29 | $116.44 | $6.02 | vs Gemini 2.5 Flash Lite |
Frequently Asked Questions
Which AI model is best for migrating from JavaScript to TypeScript?
Claude Sonnet 4 handles JS-to-TS migration exceptionally well, including type inference and proper typing.
Can AI refactor a large codebase safely?
AI can handle incremental refactoring well, but large-scale refactors should be done module-by-module with thorough testing at each step.