Compare openrouter/grok-4-fast vs anthropic/claude-opus-4.5

Model Comparison

Metric	grok-4-fast openrouter	claude-opus-4.5 anthropic
Pricing
Input Price	$0.2 / 1M tokens	$5 / 1M tokens
Output Price	$0.5 / 1M tokens	$25 / 1M tokens
Capabilities
Context Window	2M tokens	200K tokens
Capabilities	tools, reasoning
Input type	text, image	text, image
Category Scores
Overall Average	70.5	76.6
Maths	89.7	91.3
Finance	75.0	80.5
Science	77.3	81.3
Writing	64.5	71.2
Academia	72.5	78.2
Marketing	66.1	73.3
Programming	48.4	60.2
Benchmark Tests
HLE	17.0	28.4
GPQA	84.7	86.6
SciCode	44.2	49.5
MMLU-Pro	85.0	89.5
LiveCodeBench	83.2	87.1
AA Math Index	89.7	91.3
AA Coding Index	48.4	60.2
AAII	60.3	69.8

grok-4-fast Advantages

• Lower input token cost ($0.2 / 1M tokens vs $5 / 1M tokens)
• Larger context window (2M tokens vs 200K tokens)

claude-opus-4.5 Advantages

• Higher benchmark scores (76.6 vs 70.5)

Compare openrouter/grok-4-fast vs anthropic/claude-opus-4.5