ℹ️ Methodology
200 tasks across 5 categories: code generation, bug fixing, code review, refactoring, and test writing. All tasks had ground truth solutions verified by 3 senior engineers. Models given identical system prompts and tool access. Tested April 2026.
Overall Accuracy
Claude Opus 4 took the top spot overall, with GPT-5 close behind on code generation. Qwen 2.5 Coder surprised us by beating both on pure code generation quality while costing 12× less.
| Model | Overall Accuracy | Code Gen | Bug Fix | Code Review |
|---|---|---|---|---|
| Claude Opus 4 | 87.4% | 89% | 91% | 88% |
| GPT-5 | 84.1% | 91% | 86% | 81% |
| Gemini Ultra 2 | 81.8% | 82% | 83% | 80% |
| Qwen 2.5 Coder 72B | 79.2% | 88% | 74% | 71% |
| Claude Sonnet 4 | 76.4% | 78% | 79% | 74% |
Speed (Time to First Token)
For real-time agent loops, latency matters. Qwen 2.5 Coder (self-hosted on A100) wins decisively. Claude and GPT-5 are competitive via API.
| Model | TTFT (median) | p95 latency | Tokens/sec |
|---|---|---|---|
| Qwen 2.5 Coder 72B (A100) | 0.4s | 0.9s | 62 t/s |
| Claude Sonnet 4 | 0.7s | 1.4s | 48 t/s |
| GPT-5 (turbo) | 0.9s | 2.1s | 41 t/s |
| Claude Opus 4 | 1.2s | 3.0s | 34 t/s |
| Gemini Ultra 2 | 1.5s | 3.8s | 29 t/s |
Cost Per 1M Tokens
Cost arbitrage is a major lever for production agents. Routing simple tasks to cheap models and complex ones to frontier models can cut your bill by 60–80%.
| Model | Input ($/1M) | Output ($/1M) | Cost per task (avg) |
|---|---|---|---|
| Qwen 2.5 Coder (self-hosted) | $0.12 | $0.12 | $0.003 |
| Claude Sonnet 4 | $3.00 | $15.00 | $0.027 |
| GPT-5 (turbo) | $5.00 | $15.00 | $0.038 |
| Claude Opus 4 | $15.00 | $75.00 | $0.140 |
| Gemini Ultra 2 | $7.00 | $21.00 | $0.051 |
Our Recommendation by Use Case
- Best overall agent (quality first): Claude Opus 4 — highest accuracy on complex multi-step tasks
- Best code generation: GPT-5 — edge on pure code gen; excellent for scaffolding
- Best cost-performance: Qwen 2.5 Coder 72B — 88% accuracy at $0.003/task when self-hosted
- Best for high-volume pipelines: Claude Sonnet 4 — strong accuracy, reasonable cost, good speed
- Best multi-modal (code + vision): Gemini Ultra 2 — when you need to understand screenshots or diagrams
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