GPT-5 vs Phi 4
Cost and capability comparison. For a sample workload of 1,000 input and 500 output tokens across 100,000 requests/month, Phi 4 is cheaper by about $611.00/month.
| GPT-5 | Phi 4 | |
|---|---|---|
| Intelligence | ||
| Arena · Overall(LMArena Elo — higher is better) | 1406✓ | 1217 |
| Arena rank (overall) | #71✓ | #142 |
| Arena · Coding | 1395✓ | — |
| Arena · Math & reasoning | 1420✓ | — |
| Arena · Agentic / tool use | 1415✓ | — |
| Score evidence | Measured | Measured |
| Pricing (USD / 1M tokens) | ||
| Input | $1.25 | $0.0700✓ |
| Output | $10.00 | $0.1400✓ |
| Cached input (read) | $0.1250✓ | — |
| Cache write | — | — |
| Blended(3:1 input:output blend) | $3.44 | $0.0875✓ |
| Specs & capabilities | ||
| Provider | OpenAI | Microsoft |
| Context window | 128K (128,000)✓ | 16K (16,384) |
| Max output | 128,000✓ | 16,384 |
| Modalities | text, image | text |
| Vision | Yes | No |
| Tool use | Yes | Yes |
| Reasoning | Yes | No |
| Prompt caching | Yes | No |
| Batch pricing | Yes | No |
| Tokenizer | o200k_base | approx |
| Release date | — | — |
| Status | ga | ga |
Intelligence scores are community Arena ratings from LMArena / arena.ai, used under CC BY 4.0. Snapshot last refreshed 18 September 2026. Scores are a relative signal, not an absolute measure of capability. A Measured score was voted on directly; an Estimated score is inherited from an identical base model (a regional/creator-prefixed hosting duplicate). See our methodology.
Compare on your own workload
GPT-5 and Phi 4 are pre-loaded. Adjust the tokens and monthly volume to see which is cheaper for your usage.
FAQ
Which is cheaper, GPT-5 or Phi 4?
For a workload of 1,000 input and 500 output tokens over 100,000 requests/month, Phi 4 is cheaper, costing about $14.00/month versus $625.00/month.
What is the context window of GPT-5 and Phi 4?
GPT-5 supports 128,000 tokens, while Phi 4 supports 16,384 tokens.
Estimates for planning only. Verify current pricing with each provider.