Grok 4.5

Jul 2026
Grok 4.5
Compare in
on
—per task?
$2 / $6per 1M in / outcache $0.30
—output speed?
500Kcontext

Rankingat medium effort?

Full ranking →
1Fable 598.51Opus 5.598.51Gemini 3.8 Flash98.51Gemini 4 Argon98.51GPT-6 Astra98.5
···
31Grok 4.687.533Grok 4.587.234GPT-6 Luna86.7

Strong at

S
Science#12 of 312Knowledge#21 of 320
A
Agents & work tasks#42 of 177Reasoning#35 of 336Long context#55 of 314Vision#20 of 125
B
Coding#41 of 134

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperGemini 3.8 Flashhigh+13%-50%*$3.49Sampling parameters are ignored+1BetterGPT-6.1 Sollow+7%+33%$0.13Remove unsupported parameters+5OpenDeepSeek V4.1 Flash 1017high+8%-83%$0.30 / $1.20Pass back reasoning_content · Chat Completions+4CheaperGemini 3.6 Flashhigh+5%-50%*$1.60CheaperGLM 5.3 FlashmaxOpen+4%-92%$0.28Defaults to max · Self-hosted+4

History

8 versions
020406080100Jul 25Jan 26Jul 26Release dateARC-AGI-1 · Semi-private344.20 · Apr4.54.64.7
020406080100Jul 25Jan 26Jul 26Release dateARC-AGI-1 · Semi-private344.20 · Apr4.54.64.7

Benchmarks

in Chat & Knowledge
ARC-AGI-1 · public evaluation92.5#29
ARC-AGI-1 · semi-private87.2#33
ARC-AGI-2 · public evaluation57.5#31
ARC-AGI-2 · semi-private52.6#36
ARC-AGI-3 · semi-private0.3#16

FAQ

How much does Grok 4.5 cost?›

$2 per 1M input tokens and $6 per 1M output tokens; cached input $0.30 per 1M.

Is Grok 4.5 free to use?›

There is no free API; the cheapest paid price is $2 per 1M input tokens.

How good is Grok 4.5, and what is it best at?›

#35 of 336 in Chat & Knowledge, #41 of 134 in Coding, #26 of 135 in Agents & Tool Use, #28 of 197 in Writing & Language, #20 of 125 in Vision & Documents. Strongest at: Agents & work tasks, Reasoning, Science, Long context, Knowledge, Vision.

Is Grok 4.5 better than Grok 4.6?›

On ARC-AGI-1 · semi-private, Grok 4.5 scores 87.2 vs 87.5 — about the same.

How can I use Grok 4.5?›

Through the API of xAI.

What is the context window of Grok 4.5?›

500K tokens, with up to 450K output tokens.

When was Grok 4.5 released? Is there a newer version?›

Released 2026-07-08. It has been superseded by Grok 4.6.

Is Grok 4.5 open source?›

No, Grok 4.5 is a closed model available through an API. The closest open-weights option here is DeepSeek V4.1 Flash 1017.

Can Grok 4.5 read images?›

It accepts text and images, PDF files as input.

What is Grok 4.5?›

Grok 4.5 is a closed language model from xAI, released Jul 2026, the successor to Grok Build 0.1.

What are the best alternatives to Grok 4.5?›

Gemini 3.8 Flash (cheaper), GPT-6.1 Sol (better), DeepSeek V4.1 Flash 1017 (open weights).