Inception: Mercury 2.5 vs Grok 4.20 Beta
inception/mercury-2.5 · x-ai/grok-4.20-beta
As of November 5, 2026, Inception: Mercury 2.5 is the cheaper API on UberLLM: $0.0500 per million input tokens and $0.1875 per million output, versus $0.1750 / $0.3500 for Grok 4.20 Beta, about 50% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose Inception: Mercury 2.5 to cut cost; choose Grok 4.20 Beta when context size wins. Grok 4.20 Beta carries the larger context window (2,000,000 vs 260,000 tokens), which can matter for long-document work.
Inception: Mercury 2.5 vs Grok 4.20 Beta, side by side
| Spec | Inception: Mercury 2.5 | Grok 4.20 Beta |
|---|---|---|
| Price · input / 1M | $0.0500 | $0.1750 |
| Price · output / 1M | $0.1875 | $0.3500 |
| Context length | 260,000 | 2,000,000 |
| Max output tokens | 65,536 | 128,000 |
| Input modalities | text | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Reasoning | Yes | Yes |
| % off list | — | 86% off |
| First token, median (7 days) | — | 4.7 s (119 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 5, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Inception: Mercury 2.5 vs Grok 4.20 Beta — FAQ
Is Inception: Mercury 2.5 or Grok 4.20 Beta cheaper?
Inception: Mercury 2.5 is cheaper on a blended token mix, by about 50%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Inception: Mercury 2.5 and Grok 4.20 Beta?
Inception: Mercury 2.5: $0.0500 in / $0.1875 out per 1M tokens. Grok 4.20 Beta: $0.1750 in / $0.3500 out per 1M tokens. That's roughly a 50% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Inception: Mercury 2.5 and Grok 4.20 Beta with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.