Grok 4.5 vs GPT-5.4
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by xAI
|
by OpenAI
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | Jul 8, 2026 | Aug 15, 2025 |
| Pricing per million tokens | ||
| Input | $2.00/Mtok | $2.50/Mtok |
| Output | $6.00/Mtok | $15.00/Mtok |
| Blended avg | $3.00/Mtok | $5.63/Mtok |
| Cached input | — | $0.250/Mtok |
| Specifications | ||
| Context window | 500K tokens | 1M 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 / OpenAI model card, Artificial Analysis | ||
| Independent composite scores measured for both models — each on its own scale | ||
| AA Intelligence Index | 55.8 | 53.1 |
| AA Agentic Index | 48.9 | 44.2 |
| AA-Omniscience Index (−100–100) | 25.3 | 5.8 |
| LMSYS Chatbot Arena | 1469.6 ELO | 1465.6 ELO |
| GDPval-AA v2 | 1526.4 ELO | — |
| Per-benchmark results no per-benchmark score is published for both models — the composites above are what compares them | ||
| Avg benchmark score | — | 78.7 |
| Perf / dollar | — | 14 |
| GPQA Diamond | — | 88 |
| SWE-Bench Verified | — | 75 |
| Terminal-Bench 2.1 | 83.3 vendor | — |
| Humanity's Last Exam | — | 40.2 |
| ARC-AGI 2 | — | 50 |
| AIME 2025 | — | 95.5 |
| MMMLU | — | 88 |
| BFCL | — | 85 |
| HumanEval | — | 94.5 |
| MATH 500 | — | 92 |
| Providers | ||
| Available from |
xAI — $2.00/$6.00/Mtok
|
OpenAI — $2.50/$15.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Grok 4.5 | GPT-5.4 | Savings |
|---|---|---|---|
| 1M tokens | $3 | $5.63 | $2.63 (46.8%) |
| 10M tokens | $30 | $56.25 | $26.25 (46.7%) |
| 100M tokens | $300 | $562.5 | $262.5 (46.7%) |
| 1000M tokens | $3000 | $5625 | $2625 (46.7%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $3.00/Mtok blended vs $5.63 — 46.7% less on the same 50/50 token mix
- your workload re-reads context (agents, RAG, long chats): cached input costs $0.250/Mtok — 90% off its list input price, a discount Grok 4.5 doesn't offer
- you need the longer context: 1M tokens vs 500K (2×)
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.
GPT-5.4 by OpenAI costs $2.50/Mtok input and $15.00/Mtok output, with a 1M-token context window. It supports text, image input.
On a blended cost basis, Grok 4.5 is 46.7% cheaper than GPT-5.4.
The two aren't directly comparable on average benchmark score: GPT-5.4 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.