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Head to head · prices checked 22 September 2026

DeepSeek V4.1 Flash vs GPT-5.6 Luna

Two low-cost APIs for bulk work, with DeepSeek cheaper again off-peak. Both list prices from the makers’ own pages, and what three everyday jobs cost on each.

What a job costsEvery model

US dollars, standard rate, shortest context band. Price only: this page does not rank quality.

1,000 support replies
+28%what DeepSeek V4.1 Flash costs next to GPT-5.6 Luna
DeepSeek V4.1 Flash
$1.38
GPT-5.6 Luna
$1.08
DeepSeek V4.1 Flash, per M tokens
$0.30 / $1.20
GPT-5.6 Luna, per M tokens
$0.20 / $1.20

3,000 tokens in and 400 out each, at list price.

Per million tokens, DeepSeek V4.1 Flash costs $0.30 in and $1.20 out; GPT-5.6 Luna costs $0.20 in and $1.20 out. 1,000 support replies cost $1.38 on DeepSeek V4.1 Flash and $1.08 on GPT-5.6 Luna, so DeepSeek V4.1 Flash costs 28% more. DeepSeek V4.1 Flash reads up to 1M tokens at once, GPT-5.6 Luna up to 1.05M.

Side by side

Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.

DeepSeek V4.1 Flash and GPT-5.6 Luna: list prices and specifications
FactDeepSeek V4.1 FlashGPT-5.6 Luna
MakerDeepSeekOpenAI
TierSmall and fastSmall and fast
Input, per M tokens$0.30$0.20
Output, per M tokens$1.20$1.20
Cached input$0.006$0.02
Context window1M1.05M
Released10 Sep 20269 Jul 2026
WeightsOpenClosed

What a job costs on each

1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.

Cost of 1,000 runs of three jobs on DeepSeek V4.1 Flash and GPT-5.6 Luna
JobDeepSeek V4.1 FlashGPT-5.6 LunaCheaper
Support reply3,000 in, 400 out.$1.38$1.08GPT-5.6 Luna, 22% less
Document summary25,000 in, 1,000 out.$8.70$6.20GPT-5.6 Luna, 29% less
Agent task80,000 in (70,000 cached), 3,000 out.$7.02$7.00Even

The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.

The small print

What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.

DeepSeek V4.1 Flash
Peak-hour rate, recorded as the list price. Off-peak is half: $0.15 / $0.60, cache hit $0.003. API name deepseek-flash. Max output 384K. DeepSeek’s pricing page
GPT-5.6 Luna
Nano tier of the 5.6 family. Price cut 80% on 2026-07-30. Requests above 272K input tokens bill 2x input and 1.5x output ($0.40 / $1.80). Cache write $0.25. Batch and Flex 50% off. Data residency adds 10%. OpenAI’s pricing page

Other comparisons

Every head to head on the list that involves DeepSeek V4.1 Flash or GPT-5.6 Luna.

Run both for a quarter of list price

AIGROW API credit covers DeepSeek V4.1 Flash and GPT-5.6 Luna and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026