Claude 4 Sonnet vs GPT-5.5 Pro
Deprecated Anthropic mid-tier vs OpenAI's most powerful model — 5x more context at 10x the price. Premium vs ultra-premium showdown.
Pricing data verified: Jun 11, 2026
| Specification | Claude 4 Sonnet | GPT-5.5 Pro |
|---|---|---|
| Input Price (per 1M tokens) | $3.00 | $30.00 |
| Output Price (per 1M tokens) | $15.00 | $180.00 |
| Context Window | 200K tokens | 1.05M tokens |
| Tier | Mid | Ultra-Premium |
| Provider | Anthropic | OpenAI |
| License | Proprietary | Proprietary |
| Self-Hostable | No | No |
| Status | Deprecated Jun 15 | Active |
| Cost at 1M input + 500K output | $10.50 | $120.00 |
Calculate Your Exact Costs
Enter your usage to compare costs between Claude 4 Sonnet and GPT-5.5 Pro.
Which Model for Which Use Case?
Cost-Conscious Migration
Claude 4 Sonnet users should migrate to Claude Sonnet 4.6 ($3/$15) — same price, 5x more context. Or save 58% with GPT-5 ($1.25/$10). GPT-5.5 Pro is 10x more expensive and overkill for most Sonnet workloads.
When GPT-5.5 Pro Makes Sense
GPT-5.5 Pro ($30/$180) is only worth the 10x price premium if you need: (1) The absolute most capable model. (2) 1.05M context for massive documents. (3) Maximum quality regardless of cost.
Best Value Alternatives
For most Claude 4 Sonnet users, these alternatives deliver excellent quality at lower cost: GPT-5 ($1.25/$10) is 58% cheaper. Gemini 3.1 Pro ($2/$12) is 33% cheaper with 1M context.
Maximum Savings
For the deepest savings, Llama 4 Maverick ($0.27/$0.85) is 91% cheaper than Claude 4 Sonnet with 1M context. DeepSeek V4 Pro ($0.44/$0.87) is 85% cheaper. Both are open source.
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Frequently Asked Questions
Is GPT-5.5 Pro more expensive than Claude 4 Sonnet?
Yes, significantly. Claude 4 Sonnet costs $3.00/M input and $15.00/M output. GPT-5.5 Pro costs $30.00/M input and $180.00/M output. GPT-5.5 Pro is 10x more expensive on input and 12x more expensive on output. However, GPT-5.5 Pro offers 5.25x more context (1.05M vs 200K tokens). For a typical workload of 1M input + 500K output tokens/month, GPT-5.5 Pro costs $120.00 vs Claude 4 Sonnet's $10.50.
What are the best alternatives to Claude 4 Sonnet?
After Claude 4 Sonnet deprecates on June 15, 2026: (1) Claude Sonnet 4.6 ($3/$15) — direct successor, same price, 5x more context (1M). (2) GPT-5 ($1.25/$10) — 58% cheaper, 272K context. (3) Gemini 3.1 Pro ($2/$12) — 33% cheaper, 1M context. (4) Llama 4 Maverick ($0.27/$0.85) — 91% cheaper, open source, 1M context.
When should I choose GPT-5.5 Pro over cheaper alternatives?
GPT-5.5 Pro ($30/$180) is justified only when you need: (1) The absolute most capable model for complex reasoning and code generation. (2) A 1.05M token context window for massive documents or codebases. (3) Maximum quality regardless of cost. For most users, Claude Sonnet 4.6 ($3/$15) or GPT-5 ($1.25/$10) provide excellent quality at a fraction of the cost.