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Phi-3.5 Medium

14B Phi-3.5, predecessor to Phi-4 with strong benchmark efficiency for its size.

Updated

Quick facts

Released
Aug 2024
Context
128K tokens
Output / 1M
Pricing not published
License
MIT

About Phi-3.5 Medium

Phi-3.5 Medium was Microsoft's mid-2024 entry showing the same curated-synthetic-data approach scaled to 14B parameters. Strong on math, code, and reasoning relative to its parameter count. Superseded by Phi-4 for most new uses.

Benchmarks

Published scores from Microsoft's model card or independent leaderboards. We do not publish numbers we cannot source, see methodology.

HumanEval
,
Python coding pass@1
MMLU
78.9
Broad academic knowledge
GPQA
,
Graduate-level reasoning
SWE-bench
,
Real software-engineering tasks
  • MMLU78.9

Capabilities

Strengths

  • MIT license
  • 128k context
  • Strong reasoning at 14B

Tracked weaknesses

  • Superseded by Phi-4

Pricing

Per-million-token rates as published by Microsoft.

Per-token pricing not yet published for Phi-3.5 Medium. Check the official provider site for current tiers.

Call Phi-3.5 Medium from your code

Drop-in snippet for the Microsoft SDK. Set your API key in the environment and run.

typescript
import OpenAI from "openai";

const client = new OpenAI({
  // Use OPENAI_API_KEY for OpenAI, or your provider's key + baseURL.
  apiKey: process.env.OPENAI_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "phi-3-5-medium",
  messages: [
    { role: "user", content: "What's the time complexity of quicksort?" },
  ],
});

console.log(completion.choices[0].message.content);

Best for

Tasks where Phi-3.5 Medium ranks among LLMDex's top picks.

Compare Phi-3.5 Medium with…

Frequently asked

  • How much does Phi-3.5 Medium cost?
    Microsoft has not published per-token API pricing for Phi-3.5 Medium at the time of writing. Check the official site for current pricing tiers, or compare against alternative models on LLMDex.
  • What is Phi-3.5 Medium's context window?
    Phi-3.5 Medium supports a context window of 128K tokens.
  • Is Phi-3.5 Medium open source?
    Phi-3.5 Medium ships with open weights under the MIT license. You can self-host it, fine-tune it, and (subject to the license terms) deploy it commercially.
  • When was Phi-3.5 Medium released?
    Phi-3.5 Medium was released on Aug 20, 2024 by Microsoft.
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