Which Model for Which Use Case?
Claude 4 Sonnet Migration
With Claude 4 Sonnet deprecating June 15, GPT-5 offers the most direct alternative — 58% cheaper with 36% more context. Same tier, lower cost.
Code Generation
Claude 4 Sonnet was known for excellent coding. GPT-5 matches this with strong code generation, debugging, and refactoring — plus a larger 272K context for bigger codebases.
Direct Anthropic Successor
If you need Anthropic's ecosystem, Claude Sonnet 4.6 ($3/$15) is the direct successor — same price with 5x more context (1M tokens). Or try GPT-5 for 58% savings.
Ultra-Budget Alternative
For cost-sensitive workloads, DeepSeek V4 Pro ($0.44/$0.87) is 85-94% cheaper than Claude 4 Sonnet with the same 1M context. Open source and self-hostable.
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Frequently Asked Questions
Is GPT-5 cheaper than Claude 4 Sonnet?
Yes. Claude 4 Sonnet costs $3.00/M input and $15.00/M output. GPT-5 costs $1.25/M input and $10.00/M output. GPT-5 is 58% cheaper on input and 33% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, GPT-5 costs $6.25 vs Claude 4 Sonnet's $10.50 — saving you $4.25/month (40%).
How does GPT-5 quality compare to Claude 4 Sonnet?
Claude 4 Sonnet was Anthropic's mid-tier model with excellent coding capabilities, but it was retired on June 15, 2026. GPT-5 from OpenAI is a direct competitor with a 272K token context window — 36% larger than Claude 4 Sonnet's 200K. GPT-5 excels at complex reasoning, code generation, and multimodal tasks. For Sonnet-level quality at a lower price, GPT-5 is the most direct alternative.
What happened when Claude 4 Sonnet was retired on June 15?
Since June 15, 2026, Claude 4 Sonnet API calls return 410 Gone errors. You must migrate to a replacement model. Options: (1) GPT-5 ($1.25/$10) — 58% cheaper, 272K context, direct competitor. (2) Claude Sonnet 4.6 ($3/$15) — direct Anthropic successor, same price, 5x more context (1M tokens). (3) Gemini 2.5 Pro ($1.25/$10) — same price as GPT-5, 1M context. (4) DeepSeek V4 Pro ($0.44/$0.87) — 85% cheaper, 1M context, open source.
Can GPT-5 handle the same tasks as Claude 4 Sonnet?
Yes. GPT-5 handles complex reasoning, code generation, document analysis, and multimodal tasks that previously required Claude 4 Sonnet. GPT-5's 272K context window handles longer documents than Sonnet's 200K. The API is compatible with OpenAI's SDK, making migration straightforward. For tasks that specifically need Anthropic's style, Claude Sonnet 4.6 ($3/$15) is the direct successor with 1M context.