Question 1

Which scores higher on MMLU, Claude Sonnet 4 or Grok 3?

Accepted Answer

Both models score in the high 80s on MMLU. Claude Sonnet 4 scores approximately 88% and Grok 3 approximately 87%, making them essentially tied on broad knowledge benchmarks. MMLU alone is a poor differentiator at this capability tier -- the real differences show up on coding and reasoning tasks.

Question 2

Which is better for GPQA (graduate-level science), Claude Sonnet 4 or Grok 3?

Accepted Answer

Claude Sonnet 4 scores approximately 65% on GPQA Diamond while Grok 3 scores approximately 62%, giving Claude a modest advantage on graduate-level science questions. For the most demanding scientific reasoning, dedicated reasoning models like o3 or DeepSeek R1 outperform both at roughly 75%+ on GPQA Diamond.

Question 3

Which is better for coding, Claude Sonnet 4 or Grok 3?

Accepted Answer

Claude Sonnet 4 leads on coding benchmarks: Coding Arena ELO 1305 vs Grok 3's 1290, and HumanEval approximately 92% vs 89%. In practice, Claude Sonnet 4 handles multi-file refactors, complex debugging, and agentic software engineering tasks more reliably. Grok 3 is competitive for single-function code generation but falls behind on larger engineering challenges.

Question 4

Which has a bigger context window, Claude Sonnet 4 or Grok 3?

Accepted Answer

Claude Sonnet 4 has a 200K token context window, roughly 150,000 words or a 500-page book. Grok 3's context window is 128K tokens (~96,000 words). For most tasks this difference is irrelevant, but for large codebase analysis, full contract review, or ingesting multiple long documents simultaneously, Claude Sonnet 4's extra 72K tokens of headroom is a genuine advantage.

Question 5

Which is cheaper, Claude Sonnet 4 or Grok 3?

Accepted Answer

Both models are priced identically at $3.00/M input tokens and $15.00/M output tokens, so cost is not a differentiator. At 10M output tokens per month, you pay $150 for either model. Claude Sonnet 4 does offer a 90% discount on cached input tokens ($0.30/M), which can reduce costs substantially for workloads with repetitive system prompts.

Question 6

How much do Claude Sonnet 4 and Grok 3 cost at 10M tokens per month?

Accepted Answer

At 10M output tokens per month, both models cost $150 (10M x $15.00/M). Add input costs at typical 1:3 input-to-output ratios (3.3M input tokens): $9.90 per month. Total roughly $160/month for a moderate production workload on either model. Claude Sonnet 4's prompt caching can reduce input costs by up to 90% for repetitive prompts, potentially saving $8-9/month on input at this scale.

Question 7

Which is better for enterprise use, Claude Sonnet 4 or Grok 3?

Accepted Answer

Claude Sonnet 4 has a stronger enterprise story in 2026: Anthropic offers SOC 2 Type II compliance, HIPAA BAAs, AWS Bedrock and Google Vertex AI availability, and extensive safety evaluations. Grok 3 through xAI's API is newer and lacks the same enterprise compliance certifications and multi-cloud availability. For regulated industries (healthcare, finance, legal), Claude Sonnet 4 is the safer enterprise choice.

Question 8

Which is better for tool use and function calling, Claude Sonnet 4 or Grok 3?

Accepted Answer

Claude Sonnet 4 leads on tool use reliability -- Anthropic has invested heavily in its tool-use architecture and it consistently outperforms in multi-step agentic benchmarks. Grok 3 supports function calling through xAI's API but has fewer real-world agentic deployments and less third-party tooling built around it. For production agents that chain tool calls, Claude Sonnet 4 is the lower-risk choice.

Feature	Claude Sonnet 4	Grok 3
Provider	Anthropic	xAI
Input Price / 1M tokens	$3.00	$3.00
Output Price / 1M tokens	$15.00	$15.00
Context Window	200K	200K
Max Output Tokens	64,000	8,192
Arena ELO	1,280	1,285
Coding ELO	1,305	1,280
TTFT (ms)	320	200
Tokens/sec	78	90
Multimodal	Yes	No
JSON Mode	Yes	Yes
Function Calling	Yes	Yes
Vision	Yes	No

Claude Sonnet 4 vs Grok 3: Pricing, Benchmarks & Verdict (2026)

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