GPT-5 vs Claude Opus 4.5: Which AI Model is Better?
Head-to-head comparison of GPT-5 and Claude Opus 4.5 — the two most powerful AI models in 2026. Compare pricing, performance, context windows, and capabilities.
Last updated: February 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| GPT-5 | OpenAI | $1.25 | $10 | 400K | 128K |
| Claude Opus 4.5 | Anthropic | $5 | $25 | 200K | 64K |
Detailed Comparison
GPT-5
OpenAI
$1.25 / $10
per 1M tokens
Strengths
- + Excellent reasoning and multi-step tasks
- + Native vision, audio, and function calling
- + Larger context window (400K vs 200K)
Best For
Multi-modal applications, complex reasoning chains
Context Window
400K
Max Output
128K
Claude Opus 4.5
Anthropic
$5 / $25
per 1M tokens
Strengths
- + Superior creative writing
- + Better at following nuanced instructions
- + Extended thinking for deep analysis
Best For
Long-form generation, nuanced analysis, creative tasks
Context Window
200K
Max Output
64K
Verdict
GPT-5 is significantly cheaper ($1.25/$10 vs $5/$25) and offers a larger context window (400K vs 200K). Claude Opus 4.5 excels in writing quality and nuanced instruction following. Choose GPT-5 for multi-modal tasks and cost efficiency; choose Claude Opus 4.5 when output quality and creative writing matter most.
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FAQ
Which is cheaper, GPT-5 or Claude Opus 4.5?
GPT-5 costs $1.25/$10 per million tokens (input/output), while Claude Opus 4.5 costs $5/$25. GPT-5 is cheaper for input.
Which has a larger context window?
GPT-5 supports 400K context, while Claude Opus 4.5 supports 200K. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
GPT-5 is significantly cheaper ($1.25/$10 vs $5/$25) and offers a larger context window (400K vs 200K). Claude Opus 4.5 excels in writing quality and nuanced instruction following. Choose GPT-5 for multi-modal tasks and cost efficiency; choose Claude Opus 4.5 when output quality and creative writing matter most.