Claude Opus 4.5 vs o3

This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.5 and o3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.

Only o3 has a directly sourced input price: $1.00 per million tokens. Only o3 has a directly sourced output price: $4.00 per million tokens.

Neither model has a larger sourced context window in this comparison. Claude Opus 4.5 is 200,000 and o3 is 200,000.

There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.

Both models have the same recorded self-hosting status: unsupported. Claude Opus 4.5 is not marked open weight; o3 is not marked open weight.

Claude Opus 4.5 is not documented with image input; o3 is not documented with image input. This reflects supported input modalities, not vision quality.

o3 has the larger sourced maximum output: Claude Opus 4.5 supports 64,000 and o3 supports 100,000 output tokens.

Claude Opus 4.5: reasoning and tool calling. o3: reasoning and tool calling. Feature support does not establish relative quality.

Claude Opus 4.5 has 1 sourced provider route; o3 has 2, so o3 has broader tracked availability.

There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.