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SpaceXAI: Grok 4.3

x-ai/grok-4-3
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Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual

Modalities
In / out per 1M$1.25 / $2.50
Context1M
ReleasedApr 30, 2026

Providers

4 providers serve this model upstream.

Providers serving this model
ProviderInput /MOutput /MCache read /MLatency P50Throughput P50Uptime
SpaceXAI$2.50$5.00$0.400.76s66 tps100%
SpaceXAI$2.50$5.00$0.400.76s70 tps100%
SpaceXAI$1.25$2.50$0.202.57s78 tps98.21%
SpaceXAI$1.25$2.50$0.202.39s88 tps93.81%

Market-wide measurements, refreshed every 15 minutes. They describe who serves Grok 4.3 in general, not how ProjectCOZY routes your requests.

Pricing

List rates per 1M tokens — what Grok 4.3 costs pay-as-you-go elsewhere, not what you pay here.

Input
$1.25
per 1M tokens
Output
$2.50
per 1M tokens
Cache read
$0.20
per 1M cached tokens
Included in every pass
Grok 4.3 is included in every ProjectCOZY pass at no extra cost — one flat rate, no per-token metering. The rates above are there for comparison.

Performance

Time to first token and output speed across every provider, over the last 3 days.

0.0s5.0s10.0s15.0s20.0s
Oct 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
SpaceXAI SpaceXAI SpaceXAI SpaceXAI
0 tok/s200 tok/s400 tok/s600 tok/s800 tok/s
Oct 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
SpaceXAI SpaceXAI SpaceXAI SpaceXAI

Uptime

100% of requests were served successfully over the last 3 days, across all providers.

Last 3 daysAvailability 98.06%
Oct 11, 2:00 PMNow
Availability over the last 24 hoursAvailability 98.23%
100% 95% 90% 85%
Oct 13, 2:40 PMNow

Apps

Tools that most often run Grok 4.3, by tokens this week.

LLMaaJ Abstention Annotator52.7% of tokens13.2BHeyFans16.1% of tokens4.0BOpenClawPersonal Agent · 10.7% of tokens2.7BAiDetector10.5% of tokens2.6BNeurogen10% of tokens2.5B

Activity

202.4B tokens processed market-wide in the last month.

05.0B10.0B15.0B20.0B
Sep 14Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14
Tokens

FAQ

Which model id do I use for Grok 4.3?
x-ai/grok-4.3. Send it as the model field from any OpenAI-compatible client, against http://192.168.1.55/v1.
How much context does Grok 4.3 hold?
1,000,000 tokens per request, of which up to 900,000 can be the response.
What can it accept and return?
Input: text, image, file. Output: text.
What does Grok 4.3 cost on a pass?
Nothing beyond the pass itself. Pay-as-you-go elsewhere it lists at $1.25 per 1M input tokens and $2.50 per 1M output tokens.
Who built Grok 4.3?
SpaceXAI, in the Grok family.

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