Grok 4.5 vs Grok 4
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by xAI
|
by xAI
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Retired flagship |
| Released | Jul 8, 2026 | Jul 9, 2025 |
| Pricing per million tokens | ||
| Input | $2.00/Mtok | $3.00/Mtok |
| Output | $6.00/Mtok | $15.00/Mtok |
| Blended avg | $3.00/Mtok | $6.00/Mtok |
| Specifications | ||
| Context window | 500K tokens | 256K tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimage
|
| Benchmarks sources: Artificial Analysis, LMSYS Chatbot Arena (UC Berkeley), xAI Grok 4.5 launch post / Vellum LLM Leaderboard | ||
| Terminal-Bench 2.1 | 83.3 vendor | 27.2 |
| Avg benchmark score | — | 63 |
| Perf / dollar | — | 10.5 |
| GPQA Diamond | — | 87.5 |
| SWE-Bench Verified | — | 55 |
| LiveCodeBench | — | 79 |
| Humanity's Last Exam | — | 25.4 |
| ARC-AGI 2 | — | 16 |
| AIME 2025 | — | 91.7 |
| MMMLU | — | 82 |
| BFCL | — | 72 |
| HumanEval | — | 75 |
| MATH 500 | — | 82 |
| Independent composite scores each on its own scale — not part of the average above | ||
| LMSYS Chatbot Arena | 1469.6 ELO | 1410.9 ELO |
| AA Intelligence Index | 55.8 | — |
| AA Agentic Index | 48.9 | — |
| AA-Omniscience Index (−100–100) | 25.3 | — |
| GDPval-AA v2 | 1526.4 ELO | — |
| Providers | ||
| Available from |
xAI — $2.00/$6.00/Mtok
|
xAI — $3.00/$15.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Grok 4.5 | Grok 4 | Savings |
|---|---|---|---|
| 1M tokens | $3 | $6 | $3 (50%) |
| 10M tokens | $30 | $60 | $30 (50%) |
| 100M tokens | $300 | $600 | $300 (50%) |
| 1000M tokens | $3000 | $6000 | $3000 (50%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $3.00/Mtok blended vs $6.00 — 50% less on the same 50/50 token mix
- you need the longer context: 500K tokens vs 256K (2×)
- this pairing gives Grok 4 no edge on price, context, cache discount, or measured performance — pick it only for qualitative fit (ecosystem, compliance, model behavior on your prompts)
The cheaper option here — Grok 4.5 costs $3.00/Mtok blended on xAI.
Summary
Grok 4.5 by xAI costs $2.00/Mtok input and $6.00/Mtok output, with a 500K-token context window. It supports text, image input.
Grok 4 by xAI costs $3.00/Mtok input and $15.00/Mtok output, with a 256K-token context window. It supports text, image input.
On a blended cost basis, Grok 4.5 is 50% cheaper than Grok 4.It also has a larger context window.
The two aren't directly comparable on average benchmark score: Grok 4 has published per-benchmark results, while Grok 4.5 does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.