Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5
GPT-5.1
Cost Differences
GPT-5.1 costs less than GPT-5
Feature Comparison
| Feature | GPT-5 | GPT-5.1 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $1.25/1M tokens | $1.25/1M tokens |
| Output Price | $10.00/1M tokens | $10.00/1M tokens |
| Context Window | 1,000,000 tokens | 1,000,000 tokens |
| Max Output | 131,072 tokens | 131,072 tokens |
| Category | flagship | flagship |
| Capabilities | textvisionaudiocode | textvisionaudiocodereasoning |
| Release Date | 8/7/2025 | 11/12/2025 |
GPT-5 vs GPT-5.1: Which Should You Choose?
Choosing between GPT-5 and GPT-5.1 depends on your priorities: cost efficiency, context length, or raw capability. GPT-5.1 is the more affordable option at $1.25/1M input tokens.
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-5.1 would save you roughly $0.00/month compared to GPT-5. For startups and indie developers, that difference can be significant.
Output costs matter too. GPT-5 charges $10.00/1M output tokens vs $10.00 for GPT-5.1.
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 when:
- • You're already using OpenAI's API ecosystem
Choose GPT-5.1 when:
- • You need more capabilities (reasoning)
- • You're already using OpenAI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5 (OpenAI)
GPT-5.1 (OpenAI)
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