CtrlAltDebrief

GLM 5.1 vs Grok 4.3

API pricing, context window and capabilities for GLM 5.1 and Grok 4.3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GLM 5.1 wins on Terminal-Bench and on intelligence. Grok 4.3 wins on context window.

Price
Tied
Terminal-Bench
GLM 5.1
Intelligence
GLM 5.1
Context window
Grok 4.3

Key takeaways

who wins on what, from the published numbers

GLM 5.1 wins

  • Cheaper input ($1.05 vs $1.25 /1M)
  • More serving providers (12 vs 6)

Grok 4.3 wins

  • Cheaper output ($3.50 vs $2.50 /1M)
  • Larger context window (205K vs 1M)
  • Higher max output (203K vs 1M)
  • Supports vision
  • Has web search
Cheaper overall
Grok 4.3
$1.25 + $2.50 /1M
Larger context
Grok 4.3
1M
More providers
GLM 5.1
12 providers

Pricing & specs

cheapest listed route · per 1M tokens
On-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
GLM 5.1Grok 4.3
Input $/1M$1.05via DeepInfra best$1.25via xAI
Output $/1M$3.50via DeepInfra $2.50via xAI best
Context window205K 1M best
Max output203K 1M best
Serving providers12 best6
DateReleased Apr 7, 2026 Released Apr 18, 2026

Benchmarks

Benchmark scores, side by side
GLM 5.1Grok 4.3
Intelligence26.1 best24.9
Terminal-Bench62% best40%
GPQA Diamond87% 90% best
Output speed66 t/s 113 t/s best
Latency (TTFT)1.71s best27.23s

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GLM 5.1
via DeepInfra
$8.75
Grok 4.3
via OpenRouter
$8.75

Capabilities

feature support, side by side
FeatureGLM 5.1Grok 4.3
Vision—✓
Tool use✓✓
Reasoning✓✓
Audio——
Prompt caching✓✓
Structured output✓✓
Web search—✓

Related comparisons

Frequently asked questions

Which is cheaper, GLM 5.1 or Grok 4.3?
GLM 5.1 is cheaper for input ($1.05 vs $1.25 per 1M tokens) from DeepInfra. Grok 4.3 is cheaper for output ($3.50 vs $2.50 per 1M tokens) from xAI.
What is the context window difference between GLM 5.1 and Grok 4.3?
GLM 5.1 has a 205K-token context window and Grok 4.3 has 1M tokens, so Grok 4.3 can take a larger prompt.
How do GLM 5.1 and Grok 4.3 compare on benchmarks?
On the tracked benchmarks, GLM 5.1 leads on Terminal-Bench, and GLM 5.1 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026

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