Claude Opus 4.8 vs GPT-5.5 Pro
Anthropic vs OpenAI — Same $5.00/M input price, but Opus 4.8 is 86% cheaper on output. The premium showdown of 2026.
Pricing data verified: Jun 21, 2026
| Specification | Claude Opus 4.8 | GPT-5.5 Pro |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $5.00 |
| Output Price (per 1M tokens) | $25.00 | $180.00 |
| Context Window | 1M tokens | 1.05M tokens |
| Tier | Premium | Premium |
| Provider | Anthropic | OpenAI |
| Input Savings | Same price | Same price |
| Output Savings | 86% cheaper | Baseline |
| Cost at 1M input + 500K output | $17.50 | $95.00 |
Calculate Your Exact Costs
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Which Model for Which Use Case?
Cost-Effective Premium
Both models cost $5.00/M input, but Opus 4.8 is 86% cheaper on output at $25 vs $180. For output-heavy workloads like content generation, summarization, and code review, Opus 4.8 delivers premium quality at a fraction of the cost.
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 output cost is secondary, GPT-5.5 Pro is the choice.
Enterprise Cost Optimization
At 1M requests/month with 500K output tokens, Opus 4.8 saves $77.50/month compared to GPT-5.5 Pro. For enterprise-scale deployments, the 86% output cost difference translates to significant annual savings — over $9,300/year at scale.
Startup & Prototyping
When building an MVP, Opus 4.8 lets you iterate with premium quality at reasonable cost. At $17.50 for 1M input + 500K output, you get top-tier capabilities without the $95 price tag of GPT-5.5 Pro.
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Frequently Asked Questions
Are Claude Opus 4.8 and GPT-5.5 Pro the same price?
They have the same input price ($5.00/M tokens) but very different output prices. Claude Opus 4.8 costs $25.00/M output while GPT-5.5 Pro costs $180.00/M output — making Opus 4.8 86% cheaper for output tokens.
Which is better for coding — Opus 4.8 or GPT-5.5 Pro?
Both are top-tier for coding. Opus 4.8 offers strong code generation and analysis at $25/M output, while GPT-5.5 Pro provides enhanced reasoning at $180/M output. For most coding tasks, Opus 4.8 delivers comparable quality at 86% lower output cost.
How much would I save using Opus 4.8 instead of GPT-5.5 Pro?
For a workload of 1M input + 500K output tokens/month, both cost $5.00 for input, but Opus 4.8 costs $12.50 for output vs GPT-5.5 Pro's $90.00 — saving $77.50/month (86%). At scale (10M input + 5M output), you save $775/month — over $9,300/year.
When should I choose GPT-5.5 Pro over Opus 4.8?
Choose GPT-5.5 Pro when: (1) you need the absolute best reasoning and chain-of-thought capabilities, (2) cost is not a primary concern, (3) you need enhanced multi-step problem solving. Choose Opus 4.8 when: (1) you want 86% cheaper output costs, (2) similar input pricing, (3) strong quality for coding, analysis, and creative tasks.