GPT-5.4 vs Claude Opus 4.6: Which AI Model Should You Use?
A detailed head-to-head comparison of OpenAI's GPT-5.4 and Anthropic's Claude Opus 4.6 across coding, writing, reasoning, pricing, and real-world performance.
GPT-5.4 and Claude Opus 4.6 are the two most powerful AI models available in 2026. Both are premium-tier, both excel at complex tasks, but they have different strengths. This guide breaks down exactly where each model shines so you can make the right choice for your use case.
Quick Comparison
| Feature | GPT-5.4 | Claude Opus 4.6 |
|---|---|---|
| Input cost (per 1M tokens) | ~$15 | ~$15 |
| Output cost (per 1M tokens) | ~$60 | ~$75 |
| Context window | 128K | 200K |
| Best for | General reasoning, multilingual | Coding, analysis, writing |
Coding
Winner: Claude Opus 4.6
Claude Opus leads on SWE-bench Verified and HumanEval. More importantly, Claude Code enables autonomous multi-file software development — something GPT-5.4 can't match. In our testing, Opus consistently produced more correct, well-structured code with fewer iterations needed.
Writing
Winner: Claude Opus 4.6 (slightly)
Both models produce excellent text, but Claude tends to write more naturally. GPT-5.4 is reliable and follows instructions precisely, but can feel formulaic. For marketing copy and short-form content, they're roughly equal. For long-form and creative writing, Claude has an edge.
General Reasoning
Winner: Tie
Both models score similarly on MMLU and BigBench Hard. GPT-5.4 has a slight edge on some mathematical reasoning tasks, while Claude is stronger on nuanced analytical reasoning. For most business applications, the difference is negligible.
Multilingual
Winner: GPT-5.4
GPT-5.4 supports more languages and produces higher-quality output in non-English languages. If you serve a global audience, this matters.
Pricing
Input pricing is identical at ~$15/1M tokens. Claude Opus is 25% more expensive on output ($75 vs $60 per 1M tokens). For output-heavy workloads, GPT-5.4 is more cost-effective. Use our pricing calculator to compare for your specific usage pattern.
Our Recommendation
- For coding and software development → Claude Opus 4.6
- For multilingual applications → GPT-5.4
- For general business use → Either works; try both with your specific tasks
- For budget-conscious teams → Consider Claude Sonnet vs GPT-4o instead
See the full side-by-side comparison with benchmark scores, or browse all model comparisons.
