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Claude Opus 5 vs Grok 4.5

Compare Claude Opus 5 from Anthropic and Grok 4.5 from Grok on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

AnthropicClaude Opus 5GrokGrok 4.5
+ Add model · 2/4
Anthropic logo
Claude Opus 5
Anthropic · text, image → text

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, complex office deliverables, and coordinating parallel subagents. The model maintains strong instruction following and tool use across extended tasks, while remaining effective at lower effort settings for workloads that prioritize latency and token efficiency.

Input$5 /M
Output$25 /M
Cache read$0.5 /M
Details
Grok logo
Grok 4.5
Grok · text, image → text

Grok 4.5 was trained on datasets spanning knowledge in coding, science, engineering, and math. With both intelligent and efficient reasoning, Grok 4.5 excels at real engineering tasks and exceeds comparable leading models at these tasks.

Input$2 /M
Output$6 /M
Cache read$0.5 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Claude Opus 5
Grok 4.5
Input /M
$5
$2
Output /M
$25
$6
Cache read /M
$0.5
$0.5
Context length
1,000,000
500,000
Max output
128,000
500,000
Time to First Token
1.4 s
3.8 s
Throughput
62.2 tok/s
26.4 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingtoolsstructured outputslong contextweb
thinkingtoolsfunction callingstructured outputslong context
API Formats
chat_completions · claude_api · responses
Released
July 24, 2026
July 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

claude-opus-5grok-4.5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

claude-opus-5grok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
claude-opus-5grok-4.5
14201460150015401580
Overall
14711493
Coding
15231533
Math
14791526
Hard prompts
14951518
Instruction following
14661498
Multi-turn
14761486
Creative writing
14511475
Longer query
14871507
Chinese
15121560
English
14761492
Vision
claude-opus-5grok-4.5
126013001340
Overall
12821290
OCR
12941308
Diagram
13191330
Homework
13241334
WebDev Arena
claude-opus-5grok-4.5
1500158016601740
Overall
15561661
React
15591678
HTML
15711651
Gaming
15891734
Simulations
15851711
Data analytics
15211580

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

Grok 4.5
$210 /mo
Claude Opus 5
$675 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Claude Opus 5, Grok 4.5?

Grok 4.5: $6/M output tokens; Claude Opus 5: $25/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Claude Opus 5: 1533; Grok 4.5: 1523 (LMArena coding leaderboard).

Which responds faster?

Claude Opus 5: 1.4s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

Claude Opus 5 accepts 1,000,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on Claude Opus 5 and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Claude Opus 5 at 62.2 tok/s and Grok 4.5 at 26.4 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Claude Opus 5 accepts text and image input and supports thinking, tool calling, structured outputs, long context and web search; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call Claude Opus 5 and Grok 4.5 with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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