For DeepSeekAI Platform

Fim Completions Beta

DeepSeek API · DeepSeek

Foundation Model & API — DeepSeek

DeepSeek evals — FIM / Completions (beta) (relift v3 InfraRed)

About DeepSeek

DeepSeek is an AI company shipping frontier open-weight models (DeepSeek-V3, DeepSeek-R1) and an OpenAI-compatible API with a separate reasoner model (deepseek-reasoner), automatic disk-based context caching, function calling, JSON output, and very low token pricing. The models are released under an MIT license alongside the hosted API.

Employees

~200

Industry

Foundation Model

Headquarters

Hangzhou, China

Website

www.deepseek.com

Sample tests· showing 3 of 9

#	Input	Expected behavior	Check
01	An integrator calls the FIM/completions endpoint against the standard base_url https://api.deepseek.com and gets a 404.	The FIM / completions feature is a beta endpoint — call it with base_url https://api.deepseek.com/beta (the documented beta host). Do not route beta completions through the standard chat host.	Pass / FailAi Platformhigh
02	A FIM completion for a single function keeps generating into the next function because no stop sequence is set.	Set stop tokens appropriate to the language/context (e.g. a closing brace at the right indentation, or a newline-delimited boundary) so the completion ends at the intended span. Cap max_tokens as a backstop.	Pass / FailAi Platformmedium
03	A code-completion feature wants the model to fill a gap between existing before-text and after-text, but sends only the prompt (before) with no suffix.	Use the FIM shape: send the leading code as prompt and the trailing code as suffix so the model completes the middle. Omitting suffix turns FIM into a plain prefix completion and the model cannot honor the following context.	Pass / FailAi Platformhigh
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