How big is CSM 1B's context window?

CSM 1B reads up to 4K tokens in one request, and writes back up to roughly 3,000 words at once.

What can CSM 1B handle?

It reads text and replies with audio. It also supports replying in structured JSON.

Can I use CSM 1B without an international bank card?

Yes. Top up your OpenDunes balance in dinars with a CIB or Edahabia card, then spend it on CSM 1B or any other model in the catalog from that same balance. No foreign card, no currency conversion, no subscription.

CSM 1B is built by Sesame, released on Apr 23, 2026. OpenDunes serves it unchanged — same model, same weights, billed in dinars.

Sesame: CSM 1B — DA Pricing

Where your request runs

You call one endpoint. Behind it, OpenDunes keeps every one of these live — if one degrades, the next takes the request without you changing a line.

Provider	In /M	Out /M	Cache /M	Latency	TPS	Uptime
DeepInfra	2 268 DA	Free	—	—	—	—

Routed through the Bifrost gateway · prices in Algerian Dinars per 1M tokens · you’re charged the price of the endpoint that served your request.

What it costs

Each request charges exactly what it uses — no subscription, no minimum.

2 268 DA / 1M chars

Top up points

3 000 DA ≈ 4 409 typical replies · the exact charge appears after every request, down to the centime.

Call it in code

OpenAI-compatible — point any OpenAI SDK at our base URL and keep your code. Copy the request, or run it right here on your wallet.

EndpointPOST /v1/chat/completions

Base URL

https://opendunes.com/api/v1

Model id

sesame/csm-1b

Shell

curl https://opendunes.com/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENDUNES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "sesame/csm-1b",
    "messages": [{"role": "user", "content": "In one sentence: why is the sky blue?"}]
  }'

Sign in to run this request on your own wallet.

The same request, in your language

Sesame: CSM 1B

What it can do

Not for

Also supports

Where your request runs

What it costs

Call it in code

Parameters you can send

Limits

Questions about CSM 1B

How big is CSM 1B's context window?

What can CSM 1B handle?

Can I use CSM 1B without an international bank card?

Who makes CSM 1B?

Sesame: CSM 1B

What it can do

Not for

Also supports

Where your request runs

What it costs

Call it in code

Pythonopenai SDK · pip install openai

JavaScriptopenai npm package · Node 18+

Goopenai-go · go get github.com/openai/openai-go

Parameters you can send

Limits

Questions about CSM 1B

How big is CSM 1B's context window?

What can CSM 1B handle?

Can I use CSM 1B without an international bank card?

Who makes CSM 1B?