Which Model for Which Use Case?
Claude 4 Sonnet Migration
With Claude 4 Sonnet deprecating June 15, DeepSeek V4 Pro offers the cheapest migration path — 85% cheaper with 5x more context. Open source and self-hostable.
Code Generation
Claude 4 Sonnet was known for excellent coding. DeepSeek V4 Pro matches this with strong code generation at 94% lower output cost — critical for high-volume coding workloads.
Data Sovereignty
If data sovereignty matters, DeepSeek V4 Pro is open source and self-hostable. For EU data sovereignty without self-hosting, Mistral Medium 3.5 ($1.50/$7.50) is a strong alternative.
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 DeepSeek for 85% savings.
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Frequently Asked Questions
Is DeepSeek V4 Pro cheaper than Claude 4 Sonnet?
Yes, dramatically. Claude 4 Sonnet costs $3.00/M input and $15.00/M output. DeepSeek V4 Pro costs $0.435/M input and $0.87/M output. DeepSeek V4 Pro is 85% cheaper on input and 94% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, DeepSeek V4 Pro costs $0.87 vs Claude 4 Sonnet's $10.50 — saving you $9.63/month (92%).
How does DeepSeek V4 Pro 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. DeepSeek V4 Pro from DeepSeek is a budget open-source model with a 1M token context window — 5x larger than Claude 4 Sonnet's 200K. DeepSeek V4 Pro excels at coding and reasoning tasks at a fraction of the cost. It's self-hostable for data sovereignty. For budget-conscious migration, DeepSeek V4 Pro offers the best value.
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) DeepSeek V4 Pro ($0.44/$0.87) — 85-94% cheaper, 1M context, open source. (2) GPT-5 ($1.25/$10) — 58% cheaper, 272K context, direct competitor. (3) Claude Sonnet 4.6 ($3/$15) — direct Anthropic successor, same price, 5x more context (1M tokens). (4) Gemini 2.5 Pro ($1.25/$10) — same price as GPT-5, 1M context.
Can DeepSeek V4 Pro handle the same tasks as Claude 4 Sonnet?
Yes, for most workloads. DeepSeek V4 Pro handles coding, reasoning, and document analysis tasks effectively. Its 1M context window handles much longer documents than Sonnet's 200K. The main trade-off is that DeepSeek is a Chinese company — if data sovereignty matters, consider Mistral Medium 3.5 ($1.50/$7.50) or self-hosting DeepSeek. For Anthropic-specific features, Claude Sonnet 4.6 ($3/$15) is the direct successor.