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Claude Sonnet 5 vs GPT-5.5 Pro
Mid-tier meets ultra-premium. Sonnet 5 at $3/$15 is 10x cheaper than GPT-5.5 Pro at $30/$180 — with comparable 1M context. Is OpenAI's most capable model worth the massive premium?
Pricing data verified: Jul 1, 2026
| Specification | Claude Sonnet 5 (Anthropic) | GPT-5.5 Pro (OpenAI) |
|---|---|---|
| Input Price (per 1M tokens) | $3.00 | $30.00 |
| Output Price (per 1M tokens) | $15.00 | $180.00 |
| Context Window | 1M tokens | 1.05M tokens |
| Max Output | 128K tokens | 128K tokens |
| Tier | Mid | Premium |
| Provider | Anthropic | OpenAI |
Calculate Your Exact Costs
See how much you can save with Sonnet 5 — or whether GPT-5.5 Pro's premium quality justifies 10x higher cost.
Other Premium Models
Which Model for Which Use Case?
Complex Reasoning
Multi-step analysis, research synthesis, nuanced decision-making. GPT-5.5 Pro at $30/$180 is OpenAI's most capable model. Sonnet 5 at $3/$15 delivers excellent quality at 90% lower cost for most reasoning tasks.
Code Generation
Writing, debugging, refactoring code. Both models produce excellent code. Sonnet 5 at $3/$15 is 10x cheaper on output, making it the clear winner for code-heavy workloads.
Content Generation
Blog posts, documentation, marketing copy. Both models produce excellent content. Sonnet 5 at $3/$15 is 10x cheaper on output, making it the clear winner for content-heavy workloads.
High-Volume Batch Processing
At scale, the 10x cost difference is enormous. 10M input + 5M output tokens/month costs $105 with Sonnet 5 vs $1,050 with GPT-5.5 Pro — saving $945/month. For batch workloads, Sonnet 5 is the clear winner.
Choosing between Anthropic and OpenAI?
APIpulse Pro lets you compare all 49 models including Sonnet 5 ($3/$15) and GPT-5.5 Pro ($30/$180), save scenarios, and export cost reports for your team.
Frequently Asked Questions
How much cheaper is Claude Sonnet 5?
Sonnet 5 costs $3/$15 per 1M tokens vs GPT-5.5 Pro at $30/$180 — 90% cheaper on input and 92% cheaper on output. At 1M input + 500K output tokens/month, that's $10.50 vs $120, saving $109.50/month. At 10M input + 5M output, savings reach $1,095/month.
Is GPT-5.5 Pro worth 10x the cost?
GPT-5.5 Pro at $30/$180 is OpenAI's most capable model for the most demanding tasks. For the absolute most complex reasoning, the 10x premium may justify itself in quality. For most production workloads, Sonnet 5 at $3/$15 offers excellent value with comparable quality.
When should I use Sonnet 5 over GPT-5.5 Pro?
Choose Sonnet 5 ($3/$15) for virtually all production workloads: code generation, content creation, data processing, chatbots. Choose GPT-5.5 Pro ($30/$180) only for the most complex multi-step reasoning and tasks where absolute peak quality justifies 10x higher cost.
What are the context window differences?
Claude Sonnet 5 supports 1M token context windows. GPT-5.5 Pro supports 1.05M tokens. The difference is negligible — both handle very large inputs. The real difference is in pricing and model quality.
Does Sonnet 5 have introductory pricing?
Yes. Claude Sonnet 5 offers introductory pricing of $2/$10 per MTok through August 31, 2026 — 93% cheaper than GPT-5.5 Pro's standard pricing. After August 31, Sonnet 5 returns to $3/$15. GPT-5.5 Pro has no introductory pricing at $30/$180.
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