GPT-5.5 Pro vs o3-pro
GPT-5.5 Pro vs o3-pro: o3-pro is cheaper for input-heavy usage ($20.00/M vs $30.00/M input tokens), while GPT-5.5 Pro is better for long-context tasks (1,050,000 tokens).
Direct answer: choose o3-pro for lower token spend and choose GPT-5.5 Pro when your workload needs longer context.
Common pricing searches covered on this page: GPT-5.5 Pro vs o3-pro • GPT-5.5 Pro vs o3-pro pricing • GPT-5.5 Pro vs o3-pro API pricing and 5 5 pro vs o3 pro pricing.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5.5 Pro
o3-pro
Cost Differences
o3-pro costs less than GPT-5.5 Pro
Quick Recommendation
Winner for direct API pricing: o3-pro. At the default workload, o3-pro saves about $180.00/month ($2,190.00/year) versus GPT-5.5 Pro.
Feature Comparison
| Feature | GPT-5.5 Pro | o3-pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $30.00/1M tokens | $20.00/1M tokens |
| Output Price | $180.00/1M tokens | $80.00/1M tokens |
| Context Window | 1,050,000 tokens | 1,000,000 tokens |
| Max Output | 128,000 tokens | 131,072 tokens |
| Category | reasoning | reasoning |
| Capabilities | textvisioncodereasoning | textreasoningcode |
| Release Date | 4/24/2026 | 6/10/2025 |
GPT-5.5 Pro vs o3-pro: Which Should You Choose?
Choosing between GPT-5.5 Pro and o3-pro depends on your priorities: cost efficiency, context length, or raw capability. o3-pro is the more affordable option at $20.00/1M input tokens — 33% cheaper than GPT-5.5 Pro. Meanwhile, GPT-5.5 Pro offers a significantly larger context window at 1,050,000 tokens vs 1,000,000 for o3-pro.
Both models are in the reasoning category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: o3-pro would save you roughly $18,000.00/month compared to GPT-5.5 Pro. For startups and indie developers, that difference can be significant.
Output costs matter too. GPT-5.5 Pro charges $180.00/1M output tokens vs $80.00 for o3-pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. o3-pro has the edge here at $80.00/1M output tokens.
Multimodal capabilities: GPT-5.5 Pro supports vision (image inputs) while o3-pro is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose GPT-5.5 Pro when:
- • You need a larger context window (1,050,000 tokens)
- • You need more capabilities (vision)
- • You're already using OpenAI's API ecosystem
Choose o3-pro when:
- • Budget is a primary concern
- • You need longer outputs (up to 131,072 tokens)
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
GPT-5.5 Pro
- • Input pricing: $30.00/M tokens
- • Output pricing: $180.00/M tokens
- • Context window: 1,050,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Higher input cost than o3-pro
- • Higher output cost than o3-pro
o3-pro
- • Input pricing: $20.00/M tokens
- • Output pricing: $80.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Smaller context window than GPT-5.5 Pro
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5.5 Pro (OpenAI)
o3-pro (OpenAI)
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Which is cheaper, GPT-5.5 Pro or o3-pro?▼
What is the context window difference between GPT-5.5 Pro and o3-pro?▼
Which model is better for AI Agent / Agentic Workflows?▼
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