The 16-Cent Workday Kit — Run DeepSeek V4 Flash Inside Claude Code

The companion to the video. On July 31, 2026 DeepSeek released V4-Flash-0731 — MIT-licensed open weights, 284B total / 13B active parameters, a million-token context window, and agent benchmarks within ~2 points of Claude Opus 4.8 on Terminal Bench. We gave it a full workday inside Claude Code on the exact same five-task gauntlet Claude and Kimi K3 ran the day before. Ten runs, ten green — total true cost: 16 cents. THIS KIT: (1) THE 60-SECOND SWAP — the three environment variables that point Claude Code at DeepSeek's Anthropic-compatible endpoint, plus the verified Claude-name auto-mapping (ask for Sonnet, get V4 Flash) and the two honest footnotes on context ceiling and cost display. (2) THE THREE-MODEL SCORECARD — all five duels (bug hunt, refactor, feature build, hallucination trap, 853,929-token deep-context run) with every timing and every real token cost across DeepSeek, Claude, and Kimi K3. (3) THE TRAP TEST — how each model refused two invented APIs, and where Claude is still 4x faster on pure judgment. (4) THE MILLION-TOKEN PLAY — 853K tokens answered 4/4 in 32.6 seconds for $0.12, why DSpark speculative decoding makes it that fast, and when search-first still wins. (5) SURGE PRICING DECODED — the 2x Beijing peak windows translated to US Central, Eastern, and Pacific time (spoiler: the entire US business day is off-peak). (6) THE ARENA — all five gauntlet prompts so you can test the next model yourself. All numbers verified July 31, 2026 from real runs with receipts. Independent kit from Hyperautomation Labs — not affiliated with DeepSeek or Anthropic.

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