Models

ERNIE 5.1 vs Grok 4.5

Compare ERNIE 5.1 from Baidu 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.

BaiduERNIE 5.1GrokGrok 4.5
Baidu logo
ERNIE 5.1
Baidu · text → text

ERNIE 5.1 is the latest model in the Wenxin series, with comprehensive upgrades to its foundational capabilities and significant improvements in agents, knowledge, reasoning, and deep search. This upgrade uses a decoupled fully-asynchronous reinforcement learning technique to specifically address challenges encountered as large models evolve toward agent-based autonomous decision-making, such as training–inference numerical bias, low utilization of heterogeneous resources, and global issues caused by long-tail effects. It is paired with scaled agent post-training techniques to enhance model capabilities and generalization, enabling a three-step collaboration of environment, expert, and fusion that both ensures training efficiency and significantly improves the model’s stability and performance on complex tasks.

Input$0.56 /M
Output$2.54 /M
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$2.00 /M
Output$6.00 /M

Pricing & Specifications

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

ERNIE 5.1
Grok 4.5
Input /M
$0.56
$2.00
Output /M
$2.54
$6.00
Cache read /M
$0.56
$0.50
Context length
119,000
500,000
Max output
64,000
500,000
Time to First Token
-
1.6 s
Throughput
-
26.5 tok/s
Modalities
text
textimage
Supported Parameters
thinking
thinkingtoolsfunction callingstructured outputslong context
API Formats
Released
-
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.

ernie-5.1grok-4.5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

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

ernie-5.1grok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
ernie-5.1grok-4.5
1400144014801520
Overall
14681470
Coding
15141523
Math
14761478
Hard prompts
14881495
Instruction following
14531466
Multi-turn
14731477
Creative writing
14291449
Longer query
14661485
Chinese
15011511
English
14751479

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.

ERNIE 5.1
$71.83 /mo
Grok 4.5
$210 /mo

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

FAQ

Which is cheaper: ERNIE 5.1, Grok 4.5?

ERNIE 5.1: $2.54/M output tokens; Grok 4.5: $6.00/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Grok 4.5: 1523; ERNIE 5.1: 1514 (LMArena coding leaderboard).

How large is each context window?

ERNIE 5.1 accepts 119,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 64,000 tokens on ERNIE 5.1 and 500,000 tokens on Grok 4.5.

What inputs and capabilities does each model support?

ERNIE 5.1 accepts text input and supports thinking; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call ERNIE 5.1 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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