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GPT-5 mini vs GPT-5.5 Pro
OpenAI budget vs top-tier — GPT-5 mini is 99% cheaper on both input and output. When does the Pro premium make sense?
Pricing data verified: Jun 29, 2026
| Specification | GPT-5 mini | GPT-5.5 Pro |
|---|---|---|
| Input Price (per 1M tokens) | $0.25 | $30.00 |
| Output Price (per 1M tokens) | $2.00 | $180.00 |
| Context Window | 272K tokens | 1.05M tokens |
| Tier | Budget | Premium |
| Provider | OpenAI | OpenAI |
| Input Savings | 99.2% cheaper | Baseline |
| Output Savings | 98.9% cheaper | Baseline |
| Cost at 1M input + 500K output | $1.25 | $120.00 |
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Which Model for Which Use Case?
Cost-Effective Production
GPT-5 mini delivers excellent quality at $0.25/$2 per million tokens — 99% cheaper than GPT-5.5 Pro on both input and output. For most production workloads including chatbots, code assistants, and content generation, GPT-5 mini is the clear winner.
Maximum Reasoning Power
GPT-5.5 Pro's enhanced chain-of-thought reasoning excels at complex multi-step analytical tasks. If your use case demands the absolute highest quality reasoning and cost is secondary, GPT-5.5 Pro delivers.
Context Window Needs
GPT-5.5 Pro offers 1.05M context vs GPT-5 mini's 272K. If your application needs long document processing or large codebase analysis, GPT-5.5 Pro gives you 3.9x more context.
Enterprise Scale
At 1M input + 500K output tokens/month, GPT-5 mini saves $118.75/month compared to GPT-5.5 Pro. For enterprise-scale deployments, the 99% cost difference translates to $1,425/year in savings per workload.
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Frequently Asked Questions
Is GPT-5 mini cheaper than GPT-5.5 Pro?
Yes — GPT-5 mini is dramatically cheaper. GPT-5 mini costs $0.25/M input and $2/M output, while GPT-5.5 Pro costs $30/M input and $180/M output. That's 99.2% cheaper on input and 98.9% cheaper on output.
Which is better for coding — GPT-5 mini or GPT-5.5 Pro?
GPT-5.5 Pro has enhanced reasoning capabilities, but GPT-5 mini delivers excellent quality for most coding tasks at 99% lower cost. Unless you need GPT-5.5 Pro's specialized chain-of-thought for complex multi-step reasoning, GPT-5 mini is the better value.
How much would I save using GPT-5 mini instead of GPT-5.5 Pro?
For a workload of 1M input + 500K output tokens/month, GPT-5 mini costs $1.25/month vs GPT-5.5 Pro's $120/month — saving $118.75/month (99%). At scale (10M input + 5M output), you save $1,187.50/month.
When should I choose GPT-5.5 Pro over GPT-5 mini?
Choose GPT-5.5 Pro when: (1) you need the absolute best chain-of-thought reasoning, (2) cost is not a primary concern, (3) you need the 1.05M context window for very long documents. For everything else, GPT-5 mini delivers excellent quality at 99% lower cost.
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