GPT-5.5 vs o1 Pro
GPT-5.5 vs o1 Pro: GPT-5.5 is cheaper for input-heavy usage ($5.00/M vs $150.00/M input tokens), while GPT-5.5 is better for long-context tasks (1,050,000 tokens).
Direct answer: choose GPT-5.5 for lower token spend and choose GPT-5.5 when your workload needs longer context.
Common pricing searches covered on this page: GPT-5.5 vs o1 Pro • GPT-5.5 vs o1 Pro pricing • GPT-5.5 vs o1 Pro API pricing and 5 5 vs o1 pro pricing.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5.5
o1 Pro
Cost Differences
o1 Pro costs more than GPT-5.5
Quick Recommendation
Winner for direct API pricing: GPT-5.5. At the default workload, GPT-5.5 saves about $1,290.00/month ($15,695.00/year) versus o1 Pro.
Feature Comparison
| Feature | GPT-5.5 | o1 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $5.00/1M tokens | $150.00/1M tokens |
| Output Price | $30.00/1M tokens | $600.00/1M tokens |
| Context Window | 1,050,000 tokens | 200,000 tokens |
| Max Output | 128,000 tokens | 100,000 tokens |
| Category | flagship | flagship |
| Capabilities | textvisioncodereasoning | textvisioncodereasoning |
| Release Date | 4/24/2026 | 12/17/2024 |
GPT-5.5 vs o1 Pro: Which Should You Choose?
Choosing between GPT-5.5 and o1 Pro depends on your priorities: cost efficiency, context length, or raw capability. GPT-5.5 is the more affordable option at $5.00/1M input tokens — 97% cheaper than o1 Pro. Meanwhile, GPT-5.5 offers a significantly larger context window at 1,050,000 tokens vs 200,000 for o1 Pro.
Both models are in the flagship category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: GPT-5.5 would save you roughly $129,000.00/month compared to o1 Pro. For startups and indie developers, that difference can be significant.
Output costs matter too. GPT-5.5 charges $30.00/1M output tokens vs $600.00 for o1 Pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-5.5 has the edge here at $30.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose GPT-5.5 when:
- • Budget is a primary concern
- • You need a larger context window (1,050,000 tokens)
- • You need longer outputs (up to 128,000 tokens)
- • You're already using OpenAI's API ecosystem
Choose o1 Pro when:
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
GPT-5.5
- • Input pricing: $5.00/M tokens
- • Output pricing: $30.00/M tokens
- • Context window: 1,050,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Trade-offs are minor in this matchup.
o1 Pro
- • Input pricing: $150.00/M tokens
- • Output pricing: $600.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 100,000 tokens
Watch out for
- • Higher input cost than GPT-5.5
- • Higher output cost than GPT-5.5
- • Smaller context window than GPT-5.5
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5.5 (OpenAI)
o1 Pro (OpenAI)
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Sign Up for OpenAI →Frequently Asked Questions
Which is cheaper, GPT-5.5 or o1 Pro?▼
What is the context window difference between GPT-5.5 and o1 Pro?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
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