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GPT-3.5 Turbo vs Grok-1.5

Grok-1.5 leads the LLM Stats Score -2.6 to -9.4.

OpenAI · xAI · Updated for 2026

Which is better?

Grok-1.5 leads the overall LLM Stats Score -2.6 to -9.4, ranking #348 overall.

In the 6 individual benchmarks reported for both models, Grok-1.5 wins 6; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-3.5 Turbo

  • you want predictable pricing at $0.50/M input and $1.50/M output

Choose Grok-1.5

  • overall performance matters — it scores -2.6 and ranks #348 on LLM Stats
  • you value its reported benchmark strengths — it wins 6 of 6 exact shared results
  • you want the most recent training data — it shipped Mar 2024

At a glance

The differences that matter most.

GPT-3.5 Turbo
OpenAI
Grok-1.5
xAI
Core performance indexes
LLM Stats Score
-9.4
#372
-2.6
#348
Reasoning
-8.7
#365
-2.2
#338
Coding
-4.5
#266
-0.9
#254
Cost, coverage & limits
Benchmark wins
0 of 6
6 of 6
Input price
$0.50 / M
— / M
Output price
$1.50 / M
— / M
Context window
16,385
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
GPT-3.5 Turbo
Grok-1.5
Math
-2.3#311
4.9#278
Vision
-16.2#215
-5.2#208
Multimodal
-14.4#175
-2.6#167
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

8 reported for GPT-3.5 Turbo · 9 for Grok-1.5

6 shared

GPT-3.5 Turbo outperforms in 0 benchmarks, while Grok-1.5 is better at 6 benchmarks (GPQA, HumanEval, MATH, MathVista, MMLU, MMMU).

Grok-1.5 significantly outperforms across most benchmarks.

Sat Oct 03 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-3.5 Turbo specifies input context (16,385 tokens). Only GPT-3.5 Turbo specifies output context (4,096 tokens).

OpenAI
GPT-3.5 Turbo
Input16,385 tokens
Output4,096 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Sat Oct 03 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-3.5 Turbo

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-3.5 Turbo was released on 2023-03-21, while Grok-1.5 was released on 2024-03-28.

Grok-1.5 is 12 months newer than GPT-3.5 Turbo.

GPT-3.5 Turbo

Mar 21, 2023

3.5 years ago

Grok-1.5

Mar 28, 2024

2.5 years ago

1.0yr newer

Knowledge Cutoff

When training data ends

GPT-3.5 Turbo has a documented knowledge cutoff of 2021-09-30, while Grok-1.5's cutoff date is not specified.

We can confirm GPT-3.5 Turbo's training data extends to 2021-09-30, but cannot make a direct comparison without Grok-1.5's cutoff date.

GPT-3.5 Turbo

Sep 2021

Grok-1.5

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-3.5 Turbo and Grok-1.5 side-by-side, then vote on the output you prefer.

GPT-3.5 Turbo
✓ Preferred
Grok-1.5
Open in Playground

FAQ

Common questions about GPT-3.5 Turbo vs Grok-1.5.

Which is better, GPT-3.5 Turbo or Grok-1.5?

Grok-1.5 leads the LLM Stats Score -2.6 to -9.4. GPT-3.5 Turbo is made by OpenAI and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-3.5 Turbo compare to Grok-1.5 in benchmarks?

GPT-3.5 Turbo scores DROP: 70.2%, MMLU: 69.8%, HumanEval: 68.0%, MGSM: 56.3%, MATH: 43.1%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for GPT-3.5 Turbo and Grok-1.5?

GPT-3.5 Turbo supports 16K tokens and Grok-1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-3.5 Turbo and Grok-1.5?

Key differences include LLM Stats Score (-9.4 vs -2.6). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-3.5 Turbo and Grok-1.5?

GPT-3.5 Turbo is developed by OpenAI and Grok-1.5 is developed by xAI.

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