AI agents · OpenClaw · self-hosting · automation

Quick Answer

Best Cheap AI API 2026: Price Per Token, Ranked

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The Short Answer

As of August 2026, the cheapest capable flagship-family API is DeepSeek V4 Flash at $0.14/$0.28 per MTok (off-peak). For frontier quality on a budget, Grok 4.5 and Qwen3.8-Max tie at $2/$6 — ~2.5x cheaper than GPT-5.6 Sol or Claude Opus 5.

Cheapest Capable APIs (Ranked)

ModelInputOutputNotes
DeepSeek V4 Flash$0.14$0.28Off-peak; 2x peak; best cheap-but-capable
GPT-5.6 Luna$0.20$1.20After 80% cut (Jul 30); free ChatGPT default
Gemini 3.5 Flash-Lite$0.30$2.50Google-native, cheap multimodal
DeepSeek V4 Pro~$0.44~$0.87Off-peak; frontier-class open model
Gemini 3.6 Flash$1.50$7.50New Google default; 65% fewer output tokens

Cheapest Frontier Tier

ModelInputOutputWhy
Grok 4.5 / 4.6$2$6Cheapest frontier; high token efficiency
Qwen3.8-Max$2$6Matches Grok; open weights (week of Aug 10)
GPT-5.6 Terra$2$12Cut 20% Jul 30; solid mid-tier

Ultra-Cheap (Lower Capability)

Rate-bottom options like Qwen3.7 Flash hit $0.03/$0.13 per MTok — great for classification, extraction, and high-volume light tasks, but not for hard reasoning or agentic coding.

Cost Per Task

For a 30K-in/5K-out task: Luna ~$0.06, Grok 4.5 ~$0.09, Gemini 3.6 Flash ~$0.08, DeepSeek V4 Pro (off-peak) ~$0.017. Formula: 30 × (in ÷ 1000) + 5 × (out ÷ 1000).

Which Should You Pick?

  • Best cheap + capable → DeepSeek V4 Flash.
  • Cheapest frontier quality → Grok 4.5/4.6 or Qwen3.8-Max.
  • Google-native cheap → Gemini 3.6 Flash / 3.5 Flash-Lite.
  • Rock-bottom light tasks → Qwen3.7 Flash.

The Reality Check

Watch peak/valley pricing — DeepSeek rates double during peak (1–4 & 6–10 UTC), so batch off-peak. And cheap tokens on a weak model can cost more per successful task if you burn retries. Match model capability to task difficulty, then optimize price.

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