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xAI: Grok 4.5

xai/grok-4.5
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Previous-generation Grok flagship. Same standard input and output rates as Grok 4.6 but a cheaper cached-input rate.
ModalitiesTextImageText
In / out price$0.800 / $2.40 per 1M
Context500K
Released—
ProvidersPricingPerformanceAvailabilityAppsActivityFAQExplore

Providers

Where this model runs, and what each route costs. Requests are sent to a healthy provider automatically; if one errors, the gateway retries against another serving the same model.

ProviderInput /MOutput /MCache read /MLatencyThroughput
xAI$0.800$2.40$0.30019.96s46 tps

Capabilities (13)

StreamingTool callingStructured outputReasoningSystem promptVisionPrompt cachingWeb searchX SearchCode executionRemote McpPriority ProcessingBatch

Supported parameters (2)

toolsresponse_format

Any other parameter you send is ignored rather than rejected.

Pricing

What this model costs to run, next to the rate it is posted at. Caching and discounts mean the price actually paid is often below the listed one.

Effective input price
$0.800
/M tokens · listed $2.00
Effective output price
$2.40
/M tokens · listed $6.00
RateListedChargedUnit
Input$2.00$0.800per 1M tokens
Output$6.00$2.40per 1M tokens
Cache read$0.300$0.300per 1M tokens

Long-context pricing. Once the prompt is larger than the threshold, the whole request is billed at these rates per 1M tokens; rates not listed keep the price above.From 200,000 tokens in the prompt: input $4.00 / output $12.00 / cache read $0.600.

UTC

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better). Throughput and TTFT are measured on streaming requests, which are the only ones with a first-token moment to time.

Throughput
46tok/s
P50, streaming requests
Latency
19.96s
P50, end to end
UTC

Throughput

P997134 tok/s
P95216 tok/s
P5046 tok/s

Latency

P5028.6s
P7554.3s
P95109.9s
P99182.6s

Time to first token

P501977ms
P9515.1s

Cache hit rate

19.94%
Share of input tokens served from the prompt cache over the window.

Availability

The share of requests to this model that completed successfully. When an upstream provider errors, the gateway retries against another provider serving the same model, so a single provider incident does not necessarily show up here.

Success rate (30d)
92.00%
over 3,962 requests
Days with traffic
31
of the last 30

Days are UTC days. Days with no requests are omitted rather than drawn at 100% — no traffic is not evidence of availability.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

  1. 1.Oxyy Tester86.1K tokens

Activity

Token volume and request traffic to this model over time. Daily totals, UTC.

Prompt60.1M
Reasoning171.3K
Completion7.9M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Frequently asked questions

What is Grok 4.5?
Previous-generation Grok flagship. Same standard input and output rates as Grok 4.6 but a cheaper cached-input rate.
How much does Grok 4.5 cost?
Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens. Cached prompt tokens are billed at $0.300 per million. You pay per request, with no subscription.
What is the context length of Grok 4.5?
Grok 4.5 has a context window of 500,000 tokens.
Does Grok 4.5 support tool calling and structured outputs?
Yes — Grok 4.5 supports both tool calling and structured outputs.
What inputs and outputs does Grok 4.5 support?
Grok 4.5 accepts text, image as input and returns text.
What other models does xAI have?
xAI also offers Grok 4.20 (0309) Non-Reasoning, Grok 4.20 (0309) Reasoning, Grok 4.20 (0309) Multi-Agent, Grok 4.3 through Oxyy.
When was Grok 4.5 released?
No release date is published for Grok 4.5.

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