Introduction
The Composer 2 vs GPT-5.4 vs Opus 4.6 battle is heating up.
Cursor dropped a major performance bombshell in March 2026. Its new in-house model, Composer 2, now beats Anthropic’s Opus 4.6 on coding benchmarks. Furthermore, it competes closely with OpenAI’s GPT-5.4. Most importantly, it achieves these results at a fraction of the cost.
This post compares Composer 2 vs GPT-5.4 vs Opus 4.6 across key coding benchmarks. You will see the exact Terminal-Bench 2.0 scores. You will understand the massive cost difference. And you will learn which model makes sense for your workflow.
For the big picture on Cursor’s recent announcements, see our pillar post on Cursor AI 2026 . Meanwhile, for a hands-on look at Cursor 3, read our Cursor 3 review .
Terminal-Bench 2.0: The Scores
The Composer 2 vs GPT-5.4 vs Opus 4.6 comparison starts with raw benchmark results.
Terminal-Bench 2.0 is the industry standard for evaluating AI coding performance. It tests real-world tasks like debugging, refactoring, and writing new code from scratch. Here is how the three models stack up.
| Model | Terminal-Bench 2.0 Score |
|---|---|
| GPT-5.4 | 75.1 |
| Composer 2 | 61.7 |
| Opus 4.6 | 58.0 |
GPT-5.4 still leads the pack. Its 75.1 score reflects OpenAI’s massive investment in frontier models. However, Composer 2 has closed the gap significantly. It now sits comfortably ahead of Opus 4.6, which previously held the number two spot.
For many everyday coding tasks, the difference between 61.7 and 75.1 is barely noticeable. Composer 2 handles most refactors, bug fixes, and code generation tasks with ease.
The Cost Advantage: 10 to 20 Times Cheaper
The Composer 2 vs GPT-5.4 vs Opus 4.6 comparison shifts dramatically when you look at price.
| Model | Cost per Million Output Tokens |
|---|---|
| Composer 2 | $7.50 |
| GPT-5.4 Fast | $75.00 |
| Opus 4.6 Fast | $150.00 |
Composer 2 is 10 times cheaper than GPT-5.4 Fast. It is 20 times cheaper than Opus 4.6 Fast. These savings add up quickly for development teams that run thousands of AI queries per day.
Cursor achieved this cost advantage by training Composer 2 entirely in-house. The company did not rely on expensive API calls to third-party models. Instead, it built and optimized its own model specifically for coding tasks.
Real-World Performance: When the Gap Matters
The Composer 2 vs GPT-5.4 vs Opus 4.6 decision depends on your specific needs.
GPT-5.4 still excels at the most complex coding challenges. If you are building a novel algorithm or debugging a deeply nested race condition, GPT-5.4’s extra intelligence may be worth the cost. Its 75.1 score reflects superior reasoning on edge cases.
Composer 2 handles the vast majority of everyday tasks with ease. Refactoring legacy code, writing unit tests, generating boilerplate, and fixing common bugs all fall well within its capabilities. For these tasks, paying 10 times more for GPT-5.4 makes little sense.
Opus 4.6 now sits in an awkward position. It costs more than both competitors while delivering the lowest benchmark score. Anthropic will need a major update to reclaim its position.
Integration with Cursor 3
Composer 2 is deeply integrated into Cursor 3. The new Agents Window leverages the model’s speed and low cost to run multiple agents simultaneously. Cloud Handoff sessions use Composer 2 by default, keeping your cloud compute bills manageable.
For a complete walkthrough of how Composer 2 powers the new Cursor experience, see our Cursor 3 review and features guide .
Conclusion
The Composer 2 vs GPT-5.4 vs Opus 4.6 battle has a clear winner for most developers.
Composer 2 delivers 82% of GPT-5.4’s performance at just 10% of the cost. It beats Opus 4.6 on both performance and price. Unless you regularly tackle the most complex coding challenges imaginable, Composer 2 is the smart choice.
Cursor’s in-house model proves that specialized AI can compete with general-purpose giants. The cost savings alone justify giving Composer 2 a try.