Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.
OpenAI's most powerful reasoning model — top across math, coding, and science.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, Claude Opus 4.8 scores higher (89.2 vs 79.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
o3 has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. o3: $2.00 input / $8.00 output.
Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs o3 at 200K tokens.
Yes, both Claude Opus 4.8 and o3 support vision/image input.
Claude Opus 4.8 scores higher on SWE-bench Verified: Claude Opus 4.8 resolves 89% vs o3 at 62%.
Key differences: Claude Opus 4.8 has a notably higher capability index (10.0 point gap); o3 is significantly cheaper. 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 o3 for free on idapt.app to see which performs better for your specific needs.