GPT-5.5 Pro vs o1
GPT-5.5 Pro vs o1: o1 is cheaper for input-heavy usage ($15.00/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 o1 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 o1 • GPT-5.5 Pro vs o1 pricing • GPT-5.5 Pro vs o1 API pricing and 5 5 pro vs o1 pricing.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5.5 Pro
o1
Cost Differences
o1 costs less than GPT-5.5 Pro
Quick Recommendation
Winner for direct API pricing: o1. At the default workload, o1 saves about $225.00/month ($2,737.50/year) versus GPT-5.5 Pro.
Feature Comparison
| Feature | GPT-5.5 Pro | o1 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $30.00/1M tokens | $15.00/1M tokens |
| Output Price | $180.00/1M tokens | $60.00/1M tokens |
| Context Window | 1,050,000 tokens | 200,000 tokens |
| Max Output | 128,000 tokens | 65,536 tokens |
| Category | reasoning | reasoning |
| Capabilities | textvisioncodereasoning | textreasoning |
| Release Date | 4/24/2026 | 9/12/2024 |
GPT-5.5 Pro vs o1: Which Should You Choose?
Choosing between GPT-5.5 Pro and o1 depends on your priorities: cost efficiency, context length, or raw capability. o1 is the more affordable option at $15.00/1M input tokens — 50% cheaper than GPT-5.5 Pro. Meanwhile, GPT-5.5 Pro offers a significantly larger context window at 1,050,000 tokens vs 200,000 for o1.
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: o1 would save you roughly $22,500.00/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 $60.00 for o1. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. o1 has the edge here at $60.00/1M output tokens.
Multimodal capabilities: GPT-5.5 Pro supports vision (image inputs) while o1 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, code)
- • You need longer outputs (up to 128,000 tokens)
- • You're already using OpenAI's API ecosystem
Choose o1 when:
- • Budget is a primary concern
- • 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 o1
- • Higher output cost than o1
o1
- • Input pricing: $15.00/M tokens
- • Output pricing: $60.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 65,536 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)
o1 (OpenAI)
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