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deepseek-v4-flash is the small-mid of the DeepSeek V4 family. At $0.14 / 1M input it undercuts Haiku and speaks both OpenAI Chat Completions and the Anthropic Messages shape — making it a popular cost-savings substitute for gpt-5-4-mini or claude-haiku-4-5 in volume-sensitive pipelines. Pricing: 0.14/1Minput,0.14 / 1M input, 0.28 / 1M output, $0.003 / 1M cache read — see the rate card.

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Protocols

ProtocolPath
Anthropic MessagesPOST https://llm.bytespike.ai/v1/messages
OpenAI Chat CompletionsPOST https://llm.bytespike.ai/v1/chat/completions

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Quickstart

curl https://llm.bytespike.ai/v1/chat/completions \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "deepseek-v4-flash",
    "messages": [
      { "role": "user", "content": "Classify: refund / billing / technical / other.\n\nMy invoice charged twice." }
    ]
  }'

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Capabilities

CapabilitySupported
Chat Completions✅
Anthropic Messages✅
Streaming (SSE)✅
Tool use✅
Parallel tools—
JSON mode✅
Reasoning chain— (use deepseek-v4-pro)
Vision (HTTP API)❌
Context window64K tokens

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When to use

  • High-volume classification, routing, structured extraction — cheapest Chinese-LLM tier with both OpenAI + Anthropic protocol coverage.
  • Agent loops on a tight budget — tool_use works via the Anthropic endpoint at Haiku-comparable pricing.
  • Cost-optimized fallback — when your task fits Flash, prefer this id directly over deepseek-v4-pro for ~3× cost savings.
When not to use:
  • Tasks that need reasoning chain — go to deepseek-v4-pro.
  • Vision input — not on HTTP API today.

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