Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.
Refined for natural conversations — smoother, more useful, and more directly helpful.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Opus 4.8 and GPT 5.3 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.
GPT 5.3 has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. GPT 5.3: $1.75 input / $14.00 output.
Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs GPT 5.3 at 128K tokens.
Yes, both Claude Opus 4.8 and GPT 5.3 support vision/image input.
Key differences: GPT 5.3 is significantly cheaper; only Claude Opus 4.8 offers extended reasoning mode. Compare full specs on this page.
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 Claude Opus 4.8 and GPT 5.3 for free on idapt.app to see which performs better for your specific needs.