Which is cheaper, Claude Opus 5 or DeepSeek-V4-Flash-0731?
As of August 20, 2026, DeepSeek-V4-Flash-0731 is 94% cheaper on blended LLM API pricing. DeepSeek-V4-Flash-0731 costs $0.44 per million input tokens and $1.32 per million output tokens ($1.76 blended 1M-in + 1M-out). Claude Opus 5 costs $5.00 / $25.00 per million tokens ($30.00 blended). Sources: https://platform.claude.com/docs/en/about-claude/pricing and https://api-docs.deepseek.com/quick_start/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
How much does Claude Opus 5 vs DeepSeek-V4-Flash-0731 cost per million tokens?
Claude Opus 5 Claude API pricing from Anthropic is $5.00 input and $25.00 output per million tokens via Anthropic. DeepSeek-V4-Flash-0731 DeepSeek API pricing is $0.44 input and $1.32 output per million tokens via DeepSeek. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Which is better for coding, Claude Opus 5 or DeepSeek-V4-Flash-0731?
Claude Opus 5 leads on SWE-bench Verified: Claude Opus 5 at 96% vs DeepSeek-V4-Flash-0731 at 88.8%. SWE-bench measures real GitHub fixes; LiveCodeBench measures contest programming.
What is the context window for Claude Opus 5 vs DeepSeek-V4-Flash-0731?
Claude Opus 5 supports a 1M token context window, while DeepSeek-V4-Flash-0731 supports 1M tokens. DeepSeek-V4-Flash-0731 offers a larger context window. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
Which model performs better on benchmarks, Claude Opus 5 or DeepSeek-V4-Flash-0731?
Claude Opus 5 leads on 24 of 26 shared benchmarks versus DeepSeek-V4-Flash-0731's 2 wins. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Is Claude Opus 5 or DeepSeek-V4-Flash-0731 better for production use?
Both Claude Opus 5 and DeepSeek-V4-Flash-0731 are production API models. For cost-sensitive production traffic, DeepSeek-V4-Flash-0731 has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Can I switch between Claude Opus 5 and DeepSeek-V4-Flash-0731 in my app?
Yes. Call Claude Opus 5 through Anthropic and DeepSeek-V4-Flash-0731 through DeepSeek with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
How accurate is this Claude Opus 5 vs DeepSeek-V4-Flash-0731 pricing data?
List rates are the latest published Claude API pricing from Anthropic and DeepSeek API pricing, quoted per million tokens. Official rate sheets: https://platform.claude.com/docs/en/about-claude/pricing and https://api-docs.deepseek.com/quick_start/pricing. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
What is the output token limit for Claude Opus 5 and DeepSeek-V4-Flash-0731?
Claude Opus 5 supports up to 128K output tokens per request, while DeepSeek-V4-Flash-0731 supports up to 66K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Which model has better throughput, Claude Opus 5 or DeepSeek-V4-Flash-0731?
Claude Opus 5 runs at approximately 3.437096666269855 tokens/second while DeepSeek-V4-Flash-0731 runs at 5.860066709299238 tokens/second. DeepSeek-V4-Flash-0731 is faster in raw throughput. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
How do I switch the models in this Claude Opus 5 vs DeepSeek-V4-Flash-0731 comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Claude Opus 5 or DeepSeek-V4-Flash-0731 from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
