Which model is better: Claude Opus 5.5 or Grok 3 Mini?
Grok 3 Mini is 92.5% cheaper for input tokens ($0.30 vs. $4.00 per 1M tokens) and $1.20 vs. $20.00 for output tokens (13.3x cost advantage). In terms of operational performance, Grok 3 Mini delivers lower response latency at 150ms TTFT (530ms faster than Claude Opus 5.5) with 160 vs. 95 tok/s throughput. Claude Opus 5.5 leads coding evaluations at 89.9% SWE-bench Verified vs. 54.0% for Grok 3 Mini and 93.2% vs. 68.0% 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 Mini
Net Delta / Advantage
Input Cost / 1M Tokens
$4.00
$0.30
Grok 3 Mini is 13.3x cheaper
Output Cost / 1M Tokens
$20.00
$1.20
Grok 3 Mini (94.0% lower)
Prompt Cache Read / 1M
$0.200
$0.080
Grok 3 Mini is 2.5x cheaper
Prompt Cache Write / 1M
$5.00
$0.30
Grok 3 Mini is 16.7x cheaper
Context Window (Max Output)
1,024k (128k out)
131k (16k out)
Claude Opus 5.5 (7.8x larger context)
Avg TTFT Response Latency
680ms
150ms
Grok 3 Mini (530ms faster)
Generation Speed (Throughput)
95 tok/s
160 tok/s
Grok 3 Mini (+65 tok/s faster)
SWE-bench Verified (Coding)
89.9%
54%
Claude Opus 5.5 (+35.9% lead)
GPQA Diamond (PhD STEM)
93.2%
68%
Claude Opus 5.5 (+25.2% lead)
MMLU-Pro (Multi-Discipline)
92.1%
80%
Claude Opus 5.5 (+12.1% lead)
MATH-500 (Quantitative Logic)
98%
87%
Claude Opus 5.5 (+11.0% lead)
Inference Value Score (IVR)
57.8 / 100
69.2 / 100
Grok 3 Mini (+11.4 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 Mini (xAI) for high-speed reasoning model providing rapid answers and code generation with chain-of-thought capabilities at edge pricing — offering a 131k context window, 150ms TTFT, and $0.30/1M input pricing ($0.080/1M cached reads).
Grok 3 Mini is cheaper at $0.30/1M input tokens ($1.20/1M 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 Mini?
Grok 3 Mini delivers faster first-token latency at 150ms TTFT (160 tok/s throughput) compared to 680ms TTFT (95 tok/s) for Claude Opus 5.5.
How do Claude Opus 5.5 and Grok 3 Mini compare on SWE-bench coding and GPQA Diamond reasoning?
On SWE-bench Verified software engineering, Claude Opus 5.5 scores 89.9% versus 54% for Grok 3 Mini. On GPQA Diamond graduate-level STEM reasoning, Claude Opus 5.5 scores 93.2% versus 68% for Grok 3 Mini (and 98% vs 87% 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 Mini?
Choose Grok 3 Mini (xAI) for high-speed reasoning model providing rapid answers and code generation with chain-of-thought capabilities at edge pricing — offering a 131k context window, 150ms TTFT, and $0.30/1M input pricing ($0.080/1M cached reads).
