// AI Platform Drift
DeepSeek V4.1 Flash prompt pricing reduced 21.5% on OpenRouter
OpenRouter model catalogue · published 2026-10-01 04:38 UTC
CORRECTED 2026-10-02 17:58 UTC — [CORRECTION · WHY IT MATTERS] Original: “A workload sending 100M prompt tokens per day saves $430/month.” Fact: Using the quoted rounded rates, 100M prompt tokens/day saves $0.43/day or $12.90 per 30 days. Using the saved raw diff after-rate $0.015543/M, it saves $0.4257/day or $12.771 per 30 days. Neither supports $430/month. Vendor rates and applicability remain unverified.
Stood 37h 20m · cause arithmetic · every correction ↗
Captured arithmetic only; vendor rate validity, applicability and effective conditions remain unverified.
WHAT CHANGEDOpenRouter reduced prompt token pricing for deepseek/deepseek-v4.1-flash from $0.0198/M tokens to $0.0155/M tokens, effective now. Completion pricing remains $0.396/M tokens.
WHY IT MATTERSApplications with high prompt volumes will see lower costs. A workload sending 100M prompt tokens per day saves $430/month. Existing cost projections and budgets based on the previous rate are now overstated.
WHAT TO DOUpdate cost forecasts and billing estimates for any service using this model. If you route between models based on cost, re-evaluate whether this changes your selection logic.
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-v4.1-flash name: DeepSeek: DeepSeek V4.1 Flash -pricing.prompt: 0.0000000198 +pricing.prompt: 0.000000015543 pricing.completion: 0.000000396 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 0.95, needed 0.5 |
|---|---|
| triage reasoning | Prompt token price dropped ~21%, directly impacts engineering budget and cost modeling. |
| signals | pricing.prompt decreased · numerical change in cost per token · affects billing calculations for users |
| suppression | — |
| triage model | anthropic/claude-haiku-4.5 ($0.00000) |
| writer model | anthropic/claude-sonnet-4.5 ($0.00000) |