Devstral Small vs Step 3.5 Flash 2603.
model vs model · prices as of
Devstral Small and Step 3.5 Flash 2603 split the 5 rounds this table counts: the two list price rows, the cheapest price we can explain, the standard price and context. The weighting you pick decides the rest.
Mistral AIDevstral Small
$0.24/M tokens
cheapest we can explain, at NanoGPT · $0.0396 per 1,000 pages
128k context · tool calling · open weights
StepFunStep 3.5 Flash 2603
$0.57/M tokens
cheapest we can explain, at Vercel AI Gateway · $0.072 per 1,000 pages
256k context · tool calling · open weights
List price in (lower wins)
$0.10/M
$0.10/M
List price out (lower wins)
$0.30/M
$0.30/M
Cheapest we can explain (lower wins)
$0.24/M at NanoGPT
$0.57/M at Vercel AI Gateway
Standard price (lower wins)
$0.60/M
$0.60/M
Cost per 1,000 pages (lower wins)
$0.0396
$0.072
Context
128k tokens
256k tokens
Open weights
yes
yes
Tool calling
yes
yes
Structured output
not stated
not stated
Reads images
no
no
Reasoning
no
yes
Released
10 Jul 2025
2 Apr 2026
Providers selling it
9
16
Price we measure against
the maker's own
the maker's own
Trains on your prompts (no is better)
not stated
not stated
Providers selling both · 3
NanoGPT$0.24 / $0.60
Eden AI$0.60 / $0.57
LLMTR$0.60 / $0.60
Devstral Small then Step 3.5 Flash 2603, per million tokens
Go further
Add a third or fourth model, or switch the weighting, in the tool.
What moved in the last seven days
- Step 3.5 Flash 2603
Nous Portal$0.08 / $0.24 $0.10 / $0.3025% dearer ·
Frequently asked
- Which is cheaper, Devstral Small or Step 3.5 Flash 2603?
- Devstral Small, at $0.24 per million tokens against $0.57 for Step 3.5 Flash 2603, three parts input to one part output, read on 16 Sept 2026.
- Where is each one cheapest?
- Devstral Small: $0.24 at NanoGPT. Step 3.5 Flash 2603: $0.57 at Vercel AI Gateway.
- Can I buy both from one provider?
- Yes. 3 providers sell both: NanoGPT, Eden AI, LLMTR. The cheapest of them for the two together is NanoGPT.
- Which holds more context?
- Step 3.5 Flash 2603, at 256k tokens against 128k.
Prices exclude tax and are per million tokens, read 16 Sept 2026 from each provider's own catalog. The standard price blends three parts input to one part output; a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.