Bottom line
Not sure which AI to use for coding? We tested GPT-5, Claude 4, Gemini, and more to find the best code-writing AI.
TL;DR
Best overall: Claude 4 Best for agents: GPT-5 Best value: Gemini 2.5 Flash
How We Test
We run each model on:
- Bug fixes
- New feature implementation
- Code review
- Refactoring
- Test writing
Rankings
1. Claude 4 — Best Overall
Score: 9.4
- Produces highest quality code
- Best at understanding existing codebases
- Excellent at debugging
- 200K context window
Weaknesses:
- Slower than competitors
- More expensive output
2. GPT-5 — Best for Agents
Score: 9.2
- Best tool use and function calling
- Fast response times
- Great for autonomous workflows
- Large ecosystem
Weaknesses:
- Slightly lower code quality than Claude
3. Gemini 2.5 Pro — Best Value
Score: 8.9
- Excellent price/performance
- Good context window
- Fast
Weaknesses:
- Less polished code output
4. DeepSeek R1 — Best Open Source
Score: 8.5
- Free to self-host
- Good reasoning
- Can run locally
Weaknesses:
- Requires setup
- Slower than cloud APIs
By Language
| Language | Best Model |
|---|---|
| Python | Claude 4 |
| JavaScript | Claude 4 |
| TypeScript | Claude 4 |
| Go | Claude 4 |
| Rust | Claude 4 |
By Task
| Task | Best Model |
|---|---|
| Bug fixes | Claude 4 |
| New features | Claude 4 |
| Code review | Claude 4 |
| Refactoring | Claude 4 |
| Agent workflows | GPT-5 |
Cost per 1K Lines of Code
| Model | Cost |
|---|---|
| Claude 4 | $0.45 |
| GPT-5 | $0.38 |
| Gemini Flash | $0.08 |
Our Recommendation
Start with Claude 4 for code. Switch to GPT-5 when building agents.