Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. GPT-5 nano offers 200.0K more tokens in context window than Claude Opus 4. GPT-5 nano is $89.55 cheaper per million tokens. Claude Opus 4 is available on 4 providers. Both models have their strengths depending on your specific coding needs.
Anthropic
Claude Opus 4 was developed as the flagship model in the Claude 4 generation, designed to push the boundaries of AI capability in complex reasoning, analysis, and multi-step problem-solving. Built to handle the most demanding enterprise tasks, it represents Anthropic's highest tier of intelligence and capability.
OpenAI
GPT-5 Nano was developed as the most compact variant in the GPT-5 family, designed for deployment in resource-constrained environments and edge computing scenarios. Built to bring next-generation AI capabilities to devices and applications where latency and efficiency are paramount, it distills GPT-5 innovations into a minimal footprint.
2 months newer

Claude Opus 4
Anthropic
2025-05-22

GPT-5 nano
OpenAI
2025-08-07
Cost per million tokens (USD)

Claude Opus 4

GPT-5 nano
Context window and performance specifications
Average performance across 2 common benchmarks

Claude Opus 4

GPT-5 nano
GPT-5 nano
2024-05-30
Available providers and their performance metrics

Claude Opus 4
Anthropic
Bedrock
ZeroEval

Claude Opus 4

GPT-5 nano

Claude Opus 4

GPT-5 nano

GPT-5 nano
OpenAI
ZeroEval