The most powerful reasoning model OpenAI offers — but its extreme pricing means you should reach for it only when accuracy genuinely cannot be compromised.
95
Coding
62
Writing
96
Research
0
Images
4
Value
85
Long Context
Use this when
Elite-level reasoning tasks where accuracy is paramount and cost is not a constraint — graduate-level math, competitive programming, and rigorous scientific analysis.
Skip this if
You need fast responses, are working on general writing or summarization tasks, or have any sensitivity to API cost.
Pricing
$10.00/1M in
$40.00/1M out
↓50%since May 2026
Context
200k tokens
Speed
Deliberate
o3 Pro is only available via the OpenAI API and ChatGPT Pro subscription tier. Response times can range from tens of seconds to several minutes depending on problem complexity. Output pricing at $80/M tokens is 4x the cost of standard o3.
Top-tier performance on STEM benchmarks, surpassing standard o3 and competing directly with Gemini 3.1 Pro on mathematical reasoning
Extended thinking budget allows deeper verification of multi-step logical chains, reducing hallucinations on hard problems
200K context window handles large codebases, lengthy research papers, and complex multi-document analysis
Exceptional at formal proof verification, algorithm design, and problems requiring exhaustive case analysis
Weaknesses
At $20/$80 per million tokens, it is among the most expensive models available — Claude Sonnet 4.6 delivers strong reasoning at a fraction of the cost
Deliberate reasoning speed makes it unsuitable for latency-sensitive or high-throughput applications
Overkill for most everyday tasks where o3-mini or GPT-4o achieve sufficient quality at far lower cost
Real-world use cases
What people actually use OpenAI: o3 Pro for.
Solving olympiad-level mathematics problems with full step-by-step proof verification
Auditing complex smart contract code for security vulnerabilities across a large multi-file codebase
Synthesizing and critically analyzing a 150-page clinical trial dataset to surface methodological flaws
Price History
OpenAI: o3 Pro pricing over time
↓50% since May 9
88 data points · tracked daily since May 9, 2026
Ready to try it?
Start using OpenAI: o3 Pro
Elite-level reasoning tasks where accuracy is paramount and cost is not a constraint — graduate-level math, competitive programming, and rigorous scientific analysis.. Start free — no card required.
OpenAI's latest agentic flagship for coding, research, computer-use workflows, and long multi-step knowledge work.
Verdict
Best OpenAI flagship for agentic coding, research, and computer-use work.
Quality score
94%
Pricing
$2.50/1M in
$15.00/1M out
Speed
Balanced
Best for agentic coding, computer-use workflows, and complex research tasks
Context
1M tokens
Ranked from public benchmark and pricing data verified April 26, 2026: SWE-Bench Pro 58.6%, Terminal-Bench 2.0 82.7%, $5/$30 per 1M tokens, 1M API context.
AgenticCodingComputer useLong contextPremium
Best for
Agentic coding, computer-use workflows, and complex research tasks
The flagship of OpenAI's GPT-5.6 family — its most capable reasoning and agentic-coding model, with an 'ultra' mode that spawns sub-agents for long autonomous workflows.
Verdict
Best OpenAI flagship — leads terminal coding and agentic browsing.
Quality score
96%
Pricing
$2.50/1M in
$15.00/1M out
Speed
Deliberate
Best for frontier agentic coding, deep research, and hardest reasoning tasks
Context
1.1M tokens
First frontier model family to clear a customer-by-customer US government review: limited preview June 26, full public release July 9, 2026. Pricing $5/$30 ($10/$45 above 272K context). Knowledge cutoff Feb 16, 2026.
AgenticReasoningFlagshipSub-agentsPremium
Best for
Frontier agentic coding, deep research, and hardest reasoning tasks
The balanced mid-tier of the GPT-5.6 family — GPT-5.5-class capability at a fraction of the price, built for production workloads at scale.
Verdict
Best OpenAI value — near-flagship capability at 60% off.
Quality score
93%
Pricing
$1.00/1M in
$6.00/1M out
Speed
Balanced
Best for high-volume production and enterprise workloads
Context
1.1M tokens
Launched at $2.50/$15, cut to $2/$12 on July 30, 2026. Long-context above 272K: $4/$18. Part of the government-reviewed GPT-5.6 family, fully public July 9, 2026.
OpenAI: o3 Pro (OpenAI) is now indexed. The most powerful reasoning model OpenAI offers — but its extreme pricing means you should reach for it only when accuracy genuinely cannot be compromised.
OpenAI: o3 Pro is best for elite-level reasoning tasks where accuracy is paramount and cost is not a constraint — graduate-level math, competitive programming, and rigorous scientific analysis.. It is a strong fit when that workflow matters more than the tradeoffs around premium pricing and deliberate speed.
When should I avoid OpenAI: o3 Pro?
You need fast responses, are working on general writing or summarization tasks, or have any sensitivity to API cost.
What is a cheaper alternative to OpenAI: o3 Pro?
Mistral: Mistral Nemo is the lower-cost option to compare first when you want a similar workflow fit with less token spend.
What is a faster alternative to OpenAI: o3 Pro?
GPT-5.5 is the better pick when response time matters more than maximum depth or premium quality.
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