GPT-5.2 Pro vs o3

This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.2 Pro and o3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.

GPT-5.2 Pro is $21.00 and o3 is $1.00 per million tokens, so o3 is cheaper on this metric. GPT-5.2 Pro is $168.00 and o3 is $4.00 per million tokens, so o3 is cheaper on this metric.

GPT-5.2 Pro has the larger sourced context window. GPT-5.2 Pro supports 400K and o3 supports 200K.

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. GPT-5.2 Pro is not marked open weight; o3 is not marked open weight.

GPT-5.2 Pro is documented with image input; o3 is documented with image input. This reflects supported input modalities, not vision quality.

GPT-5.2 Pro has the larger sourced maximum output: GPT-5.2 Pro supports 128K and o3 supports 100K output tokens.

GPT-5.2 Pro: reasoning, tool calling, and image input. o3: reasoning, tool calling, and image input. Feature support does not establish relative quality.

GPT-5.2 Pro has 2 sourced provider routes; o3 has 2, a tie.

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.