MistralText / ChatMistral Small 4 API: Mistral AI's chat / LLM model, one key away
Mistral Small 4 via the ApexApi gateway
Mistral Small 4, a 256K multimodal tier priced for volume. A sensible default for assistant traffic on Mistral. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. It supports a 262,144-token context window, tool / function calling, image (vision) input, and streaming responses. Pricing is $0.18 input and $0.72 output per 1M tokens, billed pay-per-use from your credit balance with no subscription.
Mistral Small 4 is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: Mistral AI.
Why Mistral Small 4
262,144-token context
Reason over long documents, codebases, and multi-turn history in a single request.
Tool & function calling
Structured outputs and tool orchestration for agentic and automation workloads.
Vision input
Send images alongside text for document, UI, and visual-understanding tasks.
Specifications
- Modality
- chat
- Context window
- 262.1K tokens
- Max output
- —
- Streaming
- Yes
- Tool / function calling
- Yes
- Vision input
- Yes
Mistral Small 4: measured reliability
From real calls ApexApi made to Mistral Small 4 during health sweeps over the last 30 days. Our own measurements, not vendor claims.
- Success rate
- 100%
- Avg latency
- 3.3s
- Calls measured
- 1
- Last checked
- Aug 30
See how Mistral Small 4 compares against every model we serve on the model rankings.
Mistral Small 4 pricing
- A million tokens in and a million out costs $0.90 here, all-in.
- That makes it the 14th cheapest of the 81 chat models we serve, ranked on output price.
- It runs 12.5× cheaper than Mistral Medium 3.5, the pricier option from the same maker.
Getting started with Mistral Small 4
OpenAI-compatible. Point your client at ApexApi, swap your key, and call it. No new SDK to learn.
from openai import OpenAI
client = OpenAI(
base_url="https://api.apexapi.dev/v1",
api_key="<YOUR_APEXAPI_KEY>",
)
response = client.chat.completions.create(
model="mistralai/mistral-small-2603",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)Mistral Small 4 use cases
What teams build with Mistral Small 4 on ApexApi.
Agents & automation
Tool-using agents that orchestrate multi-step workflows and call APIs.
Coding assistants
Code generation, refactoring, reviews, and multi-file reasoning.
RAG & knowledge apps
Summarization and long-document Q&A grounded in your own data.
Mistral Small 4 vs other models
How it compares, and on ApexApi you can switch between any of them with a single string change, same key, same endpoint.
Mistral Small 4 vs Claude Opus 4.7
Compare Mistral Small 4 against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Claude Opus 4.7 API →Mistral Small 4 vs GPT-5.5
Compare Mistral Small 4 against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about GPT-5.5 API →Mistral Small 4 vs Gemini 3.1 Pro Preview
Compare Mistral Small 4 against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Gemini 3.1 Pro Preview API →Mistral Small 4 API: FAQ
How do I call Mistral Small 4 through ApexApi?
Create an ApexApi key, point your client at https://api.apexapi.dev/v1, and POST to /v1/chat/completions with the model set to `mistralai/mistral-small-2603`. The API is OpenAI-compatible, so an existing OpenAI SDK works once you change the base URL and key.
How much does Mistral Small 4 cost on ApexApi?
$0.18 per million input tokens and $0.72 per million output tokens, all-in with no separate platform fee. You buy credits and pay per call, with no subscription or minimum.
What is the context window for Mistral Small 4?
262,144 tokens.
Does Mistral Small 4 support tool calling and image input?
Mistral Small 4 supports tool / function calling, image (vision) input, and streaming responses.
What should I use instead of Mistral Small 4?
From the same maker, Ministral 3 14B 2512 costs less for lighter work and Mistral Large 3 2512 is the step up when this one falls short. Switching is one string: both run on the same endpoint and the same key, so there is nothing to re-integrate.
Ready to build with Mistral Small 4?
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