Mistral AI Makes 2 Models Free All December for Kilo Users (Spectre = Devstral 2)

Last week, we announced a new free “stealth” model inside Kilo Code called Spectre. At the time, we could only say this:

“A new stealth model from one of the top 10 AI model labs in the world.”

Today, we can finally tell you what Spectre actually is.

Spectre is Devstral 2, a next-generation agentic coding model from Mistral AI. Mistral AI has also launched its smaller sibling today, Devstral Small.

Here is the good news: Devstral 2 and Devstral Small will be free for all of December on Kilo Code.

Here’s what you can expect from the model.

What we know about Devstral 2 and Devstral Small

Devstral 2 scored 72.2% on SWE-Bench Verified, reaching near parity with DeepSeek-V3.2 (73.1%) at a fraction of the cost.

Devstral is also an open-weights model, released under a modified MIT license. The model is a dense 123B-parameter LLM, with a 256k context window.

All of this enables the model to achieve:

• Deep code understanding at scale

• Full agentic automation across large codebases

• Efficient problem-solving with unmatched cost-performance

• Architecture-level awareness enabled by the 256k context window

In comparison, Devstrall Small has 24B parameters, is locally deployable, and supports image inputs. The model scored 65.8% on SWE-bench Verified, and is competitive with models up to 5× its size.

What Kilo users think about Spectre

We’ve had thousands of Kilo users test Spectre. Here are some of the things that stood out about this model to them:

• Many noted that Spectre is very strong at following instructions.

• Spectre showed high compliance and clarity when responding to guided
  prompts.

• Many users were surprised at how fast the model is

• Overall, our users see Spectre as promising, especially when properly set up and guided. Some used a frontier model in architect mode + had Spectre execute the instructions.

How much will those models cost?

Devstral 2 costs $0.40 per 1M input tokens and $2.00 per 1M output tokens.

Devstral Small costs $0.10 per 1M input tokens, $0.30 per 1M output tokens.

Devstral 2 and Devstral Small will stay free on Kilo Code through December.

Try these models and win $50 in Kilo credits

Try Devstral 2 and Devstral Small for a few days and tell us your impressions here. We’ll choose the best answers and provide 10 people with $50 in Kilo credits.