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GPT 5.3 vs Claude Opus 5

At a glance

Refined for natural conversations — smoother, more useful, and more directly helpful.

128K ctx$1.75/$14.00 per M

Anthropic's flagship for demanding reasoning, coding, and long-horizon agentic work.

1M ctx$5.00/$25.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper52%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
128K
Context
16K
Max output
Mar 2026
Released
1M
Context
128K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input65%$1.75/M tokens
Output44%$14.00/M tokens
Cache read65%$0.17/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Chat with GPT 5.3Go to model
Chat with Claude Opus 5Go to model
Frequently Asked Questions: GPT 5.3 vs Claude Opus 5▼

Which is better, GPT 5.3 or Claude Opus 5?

▼

Both GPT 5.3 and Claude Opus 5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.3 or Claude Opus 5?

▼

GPT 5.3 has a lower blended cost. GPT 5.3: $1.75 input / $14.00 output. Claude Opus 5: $5.00 input / $25.00 output.

Which has a larger context window, GPT 5.3 or Claude Opus 5?

▼

Claude Opus 5 has a larger context window: GPT 5.3 supports 128K tokens vs Claude Opus 5 at 1M tokens.

Do both GPT 5.3 and Claude Opus 5 support vision?

▼

Yes, both GPT 5.3 and Claude Opus 5 support vision/image input.

What are the key differences between GPT 5.3 and Claude Opus 5?

▼

Key differences: GPT 5.3 is significantly cheaper; only Claude Opus 5 offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.3 and Claude Opus 5 for free on idapt.app to see which performs better for your specific needs.

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