xAI · Released Apr 17, 2026Grok 4.3
xAI's default Grok for chat, coding, agentic tools, and lower hallucination risk.
- Capability
- 149.2ECI · #55 of 148
- Input
- $1.25per 1M tokens
- Output
- $2.50per 1M tokens
- Context
- 1M30K max output
What it costs
- Input
- $1.25per million tokens
- Output
- $2.50per million tokens
- Cached input
- $0.20per million tokens
- Over 200K tokens
- $2.50 / $5.00input / output per million
- Blended (3:1)
- $1.56pricier than 65% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $3.75 |
| Team assistant25M input + 5M output tokens | $43.75 |
| Production app250M input + 50M output tokens | $437.50 |
Official xAI API price, as listed on models.dev.
Independent benchmarks
#55 of 148 scored models
The shaded band is Epoch AI’s confidence range (147.6–150.8); the tick marks the median scored model.
Scores from Epoch AI, run independently of xAI.
The details
- Lab
- xAI
- Released
- Apr 17, 2026
- Context window
- 1,000,000 tokens
- Max output
- 30,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
grok-4.3on xAI- Availability
- 27 API providerslisted on models.dev
What xAI claims
Published by the lab at launch. Settings vary, so compare these only with care.
More from xAI
About Grok 4.3
How much does Grok 4.3 cost?
Grok 4.3 costs $1.25 input / $2.50 output per million tokens (official xAI API price). Cached input is $0.20 per million tokens. Requests over 200K tokens are billed at $2.50 input / $5.00 output. At a 3:1 input-to-output mix that is $1.56 per million tokens, more expensive than 65% of the 360 priced models we track.
What is the context window of Grok 4.3?
Grok 4.3 accepts up to 1,000,000 tokens per request and can write up to 30,000 tokens in one response.
How good is Grok 4.3?
Epoch AI gives Grok 4.3 a Capabilities Index score of 149.2 (likely range 147.6–150.8), ranking it #55 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 88.8%, FrontierMath Tiers 1–3 42.8%, OTIS Mock AIME 2024–2025 93.3%, SimpleQA Verified 33.2%.
Is Grok 4.3 open source?
No. Grok 4.3 is proprietary; you use it through xAI’s API or partner platforms.
What inputs does Grok 4.3 support?
Grok 4.3 accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium and high effort settings, supports tool calling and can return structured JSON output.
When was Grok 4.3 released?
xAI released Grok 4.3 on Apr 17, 2026.
What are the best alternatives to Grok 4.3?
The closest current models from other labs on capability, price and release date are GPT-5.4 mini (OpenAI, ECI 148.8, $0.75 / $4.50), Kimi K2.7 Code (Moonshot AI, ECI 150.0, $0.95 / $4.00), GLM-5.1 (Z.ai (Zhipu), ECI 149.9, $1.40 / $4.40) and Qwen3.6 Max Preview (Alibaba (Qwen), ECI 149.2, $1.30 / $7.80).