Phi 4 API Pricing
Microsoft · Budget · MIT · released 2025-01. Prices in USD per 1 million tokens. Data snapshot: 2026-09-28.
Phi 4 has held the same list price since 2026-08-15 and is the 16th cheapest of 142 Budget models. Only one host, DeepInfra, sells it, so there is no second price to shop. It is rated a stable release but does not meet all four criteria of the FinOps Friendly badge.
- Input: $0.07 per 1M tokens
- Output: $0.14 per 1M tokens
- Batch API (input/output): not published
- Prompt-cache read: not published
- Context window: 16K
- Arena ELO: 1256 (as of 2026-09-25)
Phi 4 market position
On blended price ($0.119 per 1M tokens at 30% input, 70% output) it is cheaper than 89% of Budget models: 16th cheapest of 142. Across every category it is cheaper than 95% of priced text models in the catalogue: 16th cheapest of 281. Its Arena ELO of 1256 ranks 67th of the 68 models that carry one, above 1% of them.
Phi 4 licence, size and capabilities
Phi 4 is open source: its weights are published under MIT, an OSI-approved licence with no field-of-use limit, so it can be self-hosted as well as bought by the token. Its published size is 14B parameters. Listed capabilities: Text. Filling its 16K context window once costs $0.0011 in input tokens at list price.
Monthly cost at 100K requests, by business use case
From the after-discounts figure (prompt caching on the cached input share, batch API for async workloads, only where the provider publishes those rates), which assumes you implement both, to the list price. One figure means no discount is published.
| Use case | Tokens (in/out) | Monthly (after discounts – list) |
|---|---|---|
| Support Ticket | 1,500 / 500 | $18 |
| Knowledge Q&A | 2,000 / 800 | $25 |
| Meeting Summary | 10,000 / 1,200 | $87 |
| Marketing Content | 2,500 / 1,800 | $43 |
| Coding Task | 3,000 / 2,000 | $49 |
| Invoice Processing | 1,500 / 600 | $19 |
| Call Summary | 2,000 / 700 | $24 |
| Agent Workflow | 6,000 / 3,000 | $84 |
Phi 4 pricing by host
A host is a company that runs the model and sells it by the token — the lab that made it, a cloud platform like Amazon Bedrock, Azure or Vertex, or an independent provider. One model, several sellers, and often several prices. This model is sold by 1 host. The price quoted above is the one we publish so that models stay comparable; it is not necessarily the cheapest way to buy this model. List prices as published on 2026-09-28 via OpenRouter — negotiated rates, committed-use discounts and provisioned capacity are not shown.
DeepInfra is the only host with a published rate, $0.07 input / $0.14 output per 1M tokens, which is the price shown on this page.
| Host | Input $/1M | Output $/1M |
|---|---|---|
| DeepInfra (the price shown above) — bf16 | $0.07 | $0.14 |
Phi 4 price history
Phi 4 has been in our daily price archive since tracking began on 2026-08-15, when it listed at $0.07 input / $0.14 output per 1M tokens. No list price change since tracking began on 2026-08-15. Last checked against the 2026-09-28 snapshot.
Alternatives to Phi 4
- Next cheaper Budget model: Mercury 2.5 (Inception) at $0.117 blended, 2% less.
- Next more expensive: Gemma 3 12B (Google) at $0.120 blended, 1% more.
The nearest Budget models on Arena ELO, each with its blended price and score difference against Phi 4.
- Gemma 2 27B (Google) — $0.65 in / $0.65 out per 1M, Arena ELO 1289: 446% more expensive, 33 ELO points higher
- Llama 3.1 70B Instruct (Meta) — $0.40 in / $0.40 out per 1M, Arena ELO 1293: 236% more expensive, 37 ELO points higher
- Llama 3.1 8B Instruct (Meta) — $0.05 in / $0.08 out per 1M, Arena ELO 1211: 40% cheaper, 45 ELO points lower
- Llama 3.3 70B Instruct (Meta) — $0.10 in / $0.32 out per 1M, Arena ELO 1318: 113% more expensive, 62 ELO points higher
Common questions about Phi 4 pricing
- How much does Phi 4 cost?
- Phi 4 costs $0.07 per million input tokens and $0.14 per million output tokens on the API.
- Does Phi 4 offer batch or cached pricing?
- No batch or cache pricing is published for this model.
- What would Phi 4 cost per month?
- For a support-ticket workload (1,500 input + 500 output tokens per request) at 100K requests/month, Phi 4 costs about $18 at list prices.
- Has the price of Phi 4 changed?
- Phi 4 has been in our daily price archive since tracking began on 2026-08-15, when it listed at $0.07 input / $0.14 output per 1M tokens. No list price change since tracking began on 2026-08-15. Last checked against the 2026-09-28 snapshot.
These are list prices: real cost also depends on caching, batching, negotiated discounts, marketplace agreements, and existing contracts. Get a FinOps review from OptimNow or compare all models.
Build the business case for Phi 4 in the AI ROI Calculator: add your business value on top of these costs to get ROI, break-even and payback.
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