o3-pro-2025-06-10

Overview. o3-pro-2025-06-10 is OpenAI's higher-compute version of o3, a closed-weight reasoning model built to think through problems with reinforcement-learned reasoning tokens before producing an answer. It takes text and image input, returns text output, and supports a 200K context window with up to 100K output tokens. It's served exclusively through OpenAI's Responses API, with no Chat Completions route.

Key strengths. As a higher-compute o3 variant, it's built for depth over speed: multi-step math, code reasoning, and research-style questions where OpenAI's reasoning-token approach pays off. Benchmark signal (strong AIME math and GPQA Diamond science scores, plus top-tier Codeforces coding results) points to its clearest advantage in math, science, and code reasoning, with comparatively less distinctive benefit for open-ended writing or conversational tasks where reasoning depth matters less.

When to use it. Reach for this model when a task benefits from extended reasoning and you can tolerate longer turnaround — proof-style math, multi-step code analysis, or research synthesis run well in batch or asynchronous workflows rather than interactive chat. It's not built for realtime or latency-sensitive use; its Responses-API-only, Batch-friendly design signals long-running calls rather than conversational back-and-forth.

Limitations. The Responses-only API means it won't drop into Chat Completions-based integrations, and its batch-oriented profile makes it a poor fit for interactive or latency-sensitive use. Its knowledge cutoff is mid-2024, and OpenAI has marked this snapshot deprecated, with removal scheduled for December 2026 in favor of gpt-5.6-sol running in a comparable reasoning mode. OpenAI has not disclosed its parameter count or architecture.

Sovereignty note. o3-pro is built and hosted by OpenAI, a US company, so it carries CLOUD Act exposure and runs on closed weights with no Sovereign deployment option — workloads with strict data-residency requirements should look to EU-based or open-weights alternatives instead.