Grok 3 is 25.0% cheaper for input tokens ($3.00 vs. $4.00 per 1M tokens) and $15.00 vs. $20.00 for output tokens (1.3x cost advantage). In terms of operational performance, Grok 3 delivers lower response latency at 620ms TTFT (60ms faster than Claude Opus 5.5) with 88 vs. 95 tok/s throughput. Claude Opus 5.5 leads coding evaluations at 89.9% SWE-bench Verified vs. 65.8% for Grok 3 and 93.2% vs. 84.6% on GPQA Diamond.
Verified daily via automated API latency tests and official documentation.
Zero-Shot RAG Verified
Verified Performance & Unit Economics Delta (12 Dimensions)
Daily synchronized metrics across token pricing, prompt cache economics, latency, throughput, and 5 capability benchmarks.
Metric / Dimension
Claude Opus 5.5
Grok 3
Net Delta / Advantage
Input Cost / 1M Tokens
$4.00
$3.00
Grok 3 is 1.3x cheaper
Output Cost / 1M Tokens
$20.00
$15.00
Grok 3 (25.0% lower)
Prompt Cache Read / 1M
$0.200
$0.750
Claude Opus 5.5 is 3.8x cheaper
Prompt Cache Write / 1M
$5.00
$3.00
Grok 3 is 1.7x cheaper
Context Window (Max Output)
1,024k (128k out)
134k (16k out)
Claude Opus 5.5 (7.6x larger context)
Avg TTFT Response Latency
680ms
620ms
Grok 3 (60ms faster)
Generation Speed (Throughput)
95 tok/s
88 tok/s
Claude Opus 5.5 (+7 tok/s faster)
SWE-bench Verified (Coding)
89.9%
65.8%
Claude Opus 5.5 (+24.1% lead)
GPQA Diamond (PhD STEM)
93.2%
84.6%
Claude Opus 5.5 (+8.6% lead)
MMLU-Pro (Multi-Discipline)
92.1%
80%
Claude Opus 5.5 (+12.1% lead)
MATH-500 (Quantitative Logic)
98%
89.8%
Claude Opus 5.5 (+8.2% lead)
Inference Value Score (IVR)
57.8 / 100
52.7 / 100
Claude Opus 5.5 (+5.1 pts)
Interactive Monthly Token Economics & ROI Forecaster
Model production workloads across prompt, completion, and cached context tokens, or switch models on the fly.
Choose Claude Opus 5.5 (Anthropic) for top-ranked frontier intelligence leader for autonomous multi-step agentic coding, repository-scale migrations, and complex scientific reasoning at a 40% lower workload cost than Opus 5 — offering a 1,024k context window, 680ms TTFT, and $4.00/1M input pricing ($0.200/1M cached reads).
Choose Grok 3 (xAI) for massive compute foundation model specialized in PhD-level science reasoning, real-time data analysis, and enterprise logic — offering a 134k context window, 620ms TTFT, and $3.00/1M input pricing ($0.750/1M cached reads).
Grok 3 is cheaper at $3.00/1M input tokens ($15.00/1M output) compared to $4.00/1M input ($20.00/1M output) for Claude Opus 5.5.
Which model has lower TTFT latency and higher tok/s throughput: Claude Opus 5.5 or Grok 3?
Grok 3 delivers faster first-token latency at 620ms TTFT (88 tok/s throughput) compared to 680ms TTFT (95 tok/s) for Claude Opus 5.5.
How do Claude Opus 5.5 and Grok 3 compare on SWE-bench coding and GPQA Diamond reasoning?
On SWE-bench Verified software engineering, Claude Opus 5.5 scores 89.9% versus 65.8% for Grok 3. On GPQA Diamond graduate-level STEM reasoning, Claude Opus 5.5 scores 93.2% versus 84.6% for Grok 3 (and 98% vs 89.8% on MATH-500).
When should you choose Claude Opus 5.5?
Choose Claude Opus 5.5 (Anthropic) for top-ranked frontier intelligence leader for autonomous multi-step agentic coding, repository-scale migrations, and complex scientific reasoning at a 40% lower workload cost than Opus 5 — offering a 1,024k context window, 680ms TTFT, and $4.00/1M input pricing ($0.200/1M cached reads).
When should you choose Grok 3?
Choose Grok 3 (xAI) for massive compute foundation model specialized in PhD-level science reasoning, real-time data analysis, and enterprise logic — offering a 134k context window, 620ms TTFT, and $3.00/1M input pricing ($0.750/1M cached reads).
