Phi-4-Reasoning is a state-of-the-art open-weight reasoning model finetuned from Phi-4 using supervised fine-tuning on a dataset of chain-of-thought traces and reinforcement learning. The supervised fine-tuning dataset includes a blend of synthetic prompts and high-quality filtered data from public domain websites, focused on math, science, and coding skills as well as alignment data for safety and Responsible AI. The goal of this approach was to ensure that small capable models were trained with data focused on high quality and advanced reasoning.
AIHubMix Phi 4 (reasoning) vs DeepSeek V4 Flash
Compare AIHubMix Phi 4 (reasoning) from Microsoft and DeepSeek V4 Flash from DeepSeek on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
(This model currently points to the older 0423 version; if you need to request the latest version, you can choose the model deepseek-v4-flash-0731)DeepSeek-V4 features an ultra-long context of one million characters and achieves leading performance domestically and in the open-source domain in agent capabilities, world knowledge, and reasoning.
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
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Performance Past 3 Days
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FAQ
Which is cheaper: AIHubMix Phi 4 (reasoning), DeepSeek V4 Flash?
AIHubMix Phi 4 (reasoning): $0.2/M output tokens; DeepSeek V4 Flash: $0.284/M. Use the cost calculator above to estimate your own workload.
How large is each context window?
AIHubMix Phi 4 (reasoning) accepts 128,000 and DeepSeek V4 Flash accepts 1,000,000 input tokens. Maximum output per request is 4,000 tokens on AIHubMix Phi 4 (reasoning) and 384,000 tokens on DeepSeek V4 Flash.
What inputs and capabilities does each model support?
AIHubMix Phi 4 (reasoning) accepts text input and supports thinking; DeepSeek V4 Flash accepts text input and supports tool calling, function calling, structured outputs and thinking.
Can I call AIHubMix Phi 4 (reasoning) and DeepSeek V4 Flash with the same API key?
Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.
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