Compare/Grok Code Fast 1 vs GPT-3.5 Turbo

Grok Code Fast 1vsGPT-3.5 Turbo

Side-by-side comparison of pricing, 12 benchmarks, and generation speed.

xAI

Grok Code Fast 1

Input
$0.2/M
Output
$1.5/M
Speed
186 tok/s
TTFT
2.79s
OpenAI

GPT-3.5 Turbo

Input
$0.5/M
Output
$1.5/M
Speed
100 tok/s
TTFT
0.43s

Winner by Category

Cheaper
Grok Code Fast 1
Faster (tok/s)
Grok Code Fast 1
Lower Latency
GPT-3.5 Turbo
Benchmarks (11-1)
Grok Code Fast 1

Pricing Comparison

MetricGrok Code Fast 1GPT-3.5 Turbo
Input ($/M tokens)$0.2$0.5
Output ($/M tokens)$1.5$1.5
Cost for 1M input + 100K output tokens:
Grok Code Fast 1$0.35
GPT-3.5 Turbo$0.65

Speed Comparison

Output Speed (tokens/s) — higher is better
Grok Code Fast 1
186 tok/s
GPT-3.5 Turbo
100 tok/s
Time to First Token (seconds) — lower is better
Grok Code Fast 1
2.79s
GPT-3.5 Turbo
0.43s

Benchmark Comparison

Data from Artificial Analysis API — 12 benchmarks

Intelligence Index
28.79.0
Coding Index
23.710.7
Math Index
43.3
GPQA Diamond
72.7%29.7%
MMLU-Pro
79.3%46.2%
LiveCodeBench
65.7%
AIME 2025
43.3%
MATH-500
44.1%
Humanity's Last Exam
7.5%
SciCode
36.2%
IFBench
41.4%
TerminalBench
17.4%
Grok Code Fast 111 wins
1 winsGPT-3.5 Turbo

Frequently Asked Questions

Which is cheaper, Grok Code Fast 1 or GPT-3.5 Turbo?

Grok Code Fast 1 is cheaper overall. Its blended price (3:1 input/output ratio) is $0.53/M tokens vs $0.75/M for GPT-3.5 Turbo.

Which model performs better on benchmarks?

Grok Code Fast 1 wins 11 out of 12 benchmarks compared to 1 for GPT-3.5 Turbo. See the detailed benchmark chart above for per-category results.

Which is faster for real-time applications?

Grok Code Fast 1 generates tokens faster at 186 tok/s vs 100 tok/s. However, GPT-3.5 Turbo has lower time-to-first-token (0.43s vs 2.79s).

When should I use Grok Code Fast 1 vs GPT-3.5 Turbo?

Choose based on your priorities: Grok Code Fast 1 for lower cost, Grok Code Fast 1 for stronger benchmark performance, and Grok Code Fast 1 for faster generation. For latency-sensitive apps, check the TTFT comparison above.