// AI Platform Drift

DeepSeek Flash Latest pricing: prompt down 20%, completion up 300%

OpenRouter model catalogue · published 2026-09-24 11:15 UTC

CORRECTED 2026-10-02 17:58 UTC — [CORRECTION · WHY IT MATTERS] Original: “A workload with 1:10 prompt-to-completion ratio now costs 2.6x more per request.” Fact: At one prompt token per ten completion tokens, captured total cost becomes 3.9373 times the old cost, a 293.7% increase.

Stood 198h 42m · cause arithmetic · every correction ↗

Captured arithmetic only; vendor rate validity, applicability and effective conditions remain unverified.

ACTION NEEDED BUDGET PRICINGMODEL

WHAT CHANGEDOpenRouter changed pricing for deepseek/deepseek-flash-latest effective now: prompt tokens decreased from $0.00000005 to $0.00000004 (20% reduction), completion tokens increased from $0.00000025 to $0.000001 (300% increase, 4x multiplier).

WHY IT MATTERSApplications generating long outputs will see significantly higher costs despite cheaper input. A workload with 1:10 prompt-to-completion ratio now costs 2.6x more per request. Budget forecasts based on previous pricing are immediately inaccurate.

WHAT TO DOPull last 30 days of usage logs for this model, calculate actual prompt:completion token ratios for your workloads, and reforecast monthly costs using the new rates. Escalate revised numbers to whoever owns the API budget.

Model-reported confidence 95% (not measured accuracy) Primary source ↗ written by anthropic/claude-sonnet-4.5

Show the reasoning — raw diff, triage verdict, confidence

RAW DIFF

 id: ~deepseek/deepseek-flash-latest
 name: DeepSeek: DeepSeek Flash Latest
-pricing.prompt: 0.00000005
-pricing.completion: 0.00000025
+pricing.prompt: 0.00000004
+pricing.completion: 0.000001
 context_length: 1048576
 top_provider.max_completion_tokens: 943718

HOW IT WAS JUDGED

Triage signals below are model-reported assertions, preserved verbatim; they are not independent arithmetic verification.

triage verdict	MATERIAL at 0.98, needed 0.5
triage reasoning	Pricing changes on active model affect cost planning and budget forecasts for teams using this endpoint.
signals	pricing.prompt decreased 20% (0.00000005 → 0.00000004) · pricing.completion increased 300% (0.00000025 → 0.000001) · price change on production model
suppression	—
triage model	anthropic/claude-haiku-4.5 ($0.00000)
writer model	anthropic/claude-sonnet-4.5 ($0.00000)