grok-4.5
A balanced general-purpose model in the Grok line, trading a little frontier reasoning for steadier everyday performance. Good for mixed production workloads with real-time grounding.
At a glance
Released
Jun 10, 2026
Provider
xAI
Context window
256,000 tokens
Max output
64,000 tokens
Modalities
Text + image → text
Knowledge cutoff
May 2026
API model ID
grok-4.5License
Proprietary (API only)
Pricing
Standard
Input$2 / 1M
Output$6 / 1M
Long-context requests are billed at $4 in / $12 out per 1M. A typical 1,500-token prompt with a 650-token answer costs ≈ $0.007 on the standard tier. Run your own prompt through the calculator →
What's new vs the previous model
Compared withgrok-4.3 (March 2026)
- Better general capability and tool use than 4.3
- Below the 4.6 and 4.7 reasoning tiers
Best use cases
General assistants
Handles everyday chat, writing and coding reliably.
Live grounding
Pulls current context from X when queries need it.
Mixed workloads
Covers a broad range of tasks without flagship pricing.
Strengths & limitations
Strengths
- Well-rounded
- Real-time grounding
- Reasonable cost
Limitations
- Not a frontier reasoner
- No audio or video input
How to test it
- No-code: open grok.com and pick grok-4.5 from the model switcher — no API key needed.
- Playground: sign in to the xAI Console and run prompts in the workbench, then copy the generated code.
- API: create a key in the xAI Console and call the API (example below).
curl https://api.x.ai/v1/chat/completions \
# OpenAI-compatible endpoint
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "grok-4.5",
"messages": [{"role": "user", "content": "Explain tokenization in one paragraph."}]
}'