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xAI · Grok
No. 16
Grok 4.3
xAI's flagship: strong math reasoning and real-time knowledge at aggressive pricing.
Field notes
- Context window
- 1Mtokens
- Max output
- 66Ktokens
- Input price
- $1.25/ 1M tokens
- Output price
- $2.50/ 1M tokens
- Cached input
- $0.20/ 1M tokens
- Modalities
- Text, Image, Video, Pdf
- Knowledge cutoff
- Dec 2025
- Released
- Apr 2026
- Approx. speed
- ~127 tok/s
Overview
What this model is
Grok 4.3 is xAI's current flagship, a large reasoning model with a 1M-token context window and native access to real-time X/web data. It benchmarks near the top on math and science and is a genuinely strong general model. In practice its long-horizon agentic coding is less consistent than the Claude/GPT frontier — it can be verbose, over-confident, and drift on multi-step tool use.
Strengths
- Excellent math and scientific reasoning
- Real-time knowledge via X/web integration
- Native video input (new in 4.3)
- Large 1M-token context window
- Competitive pricing for a flagship
Trade-offs
- Long agentic coding less reliable than Claude/GPT
- Verbose and occasionally over-confident output
- Tool-use consistency lags the frontier
- Tone and moderation can be polarizing
Best for
- Math and STEM reasoning
- Real-time research and current events
- General chat and analysis
- Long-context document work
Not ideal for
- Unsupervised long-horizon agentic coding
- Safety-critical automated workflows
Capabilities
Capability profile
Normalized 0–100 scores, comparable across the whole catalog.
- Reasoning
- 84
- Coding
- 74
- Math
- 90
- Writing
- 82
- Knowledge
- 85
- Speed
- 68
- Agentic
- 73
- Vision
- 80
- Multilingual
- 82
- Long Context
- 84
Benchmarks
How it scores
Public benchmark results, with independent third-party results where available. Bars normalize percentages to 100 and Elo ratings to a 1500 ceiling.
Independent index
Artificial Analysis Intelligence Index
Composite of ~9–10 independent evals · Artificial Analysis
38/ 100
BenchmarkResult
Artificial Analysis Intelligence Indexindependent
GeneralArtificial Analysis
38%
SWE-bench Verifiedindependent
CodingSWE-bench
76.7%
τ-benchindependent
Agenticτ-bench
78.9%
AIME 2025
MathVendor-reported
100%
MMLU-Pro
KnowledgeVendor-reported
91.2%
Terminal-Bench Hardindependent
AgenticArtificial Analysis
37.9%
LMArena Eloindependent
GeneralLMArena
1496Elo