OpenAI · Balanced
GPT-3.5 Turbo
Older model. Brought ChatGPT to the mainstream, seen as dated nowadays. 90% cheaper than GPT-4-Turbo, recommended for very simple tasks.
- Input
- Text
- Output
- Text
- Discovery tier
- Balanced
Pricing
USD per 1M tokens- Input
- $0.50
- Output
- $1.50
Reference prices as published by the model provider. API example
Specifications
- Context window
- 16.4K
- Max output
- 4.1K
Side by side
GPT-3.5 Turbo compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| GPT-3.5 TurboOpenAIThis model | GPT 6 Luna ProOpenAIRemove | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Discovery tier | Balanced | Efficient |
| Added | Jan 1, 2024 | Sep 22, 2026 |
| Limits | ||
| Context window | 16.39K | 1.05MBest |
| Max output | 4.1K | 128KBest |
| Average output | — | 2.8K tokens |
| Pricing, USD per 1M tokens | ||
| Input | $0.50 | $0.10Best |
| Output | $1.50 | $0.50Best |
| Cache read | — | $0.01 |
| Cache write | — | $0.13 |
| Performance | ||
| Throughput | — | 245.6 tok/s |
| Time to first token | — | 22.2 s |
| Request success (24h) | — | 100.0% |
| Benchmark indexes | ||
| Intelligence Index | 5.5 | — |
| Coding Index | 10.7 | — |
| Capabilities | ||
| Reasoning | No | Yes |
| Tools | No | Yes |
| Vision | No | Yes |
| Structured output | No | Yes |
| PDF input | No | Yes |
| Reasoning effort | — | low, medium, high, xhigh, max |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- GPT-3.5 Turbo
- GPT 6 Luna Pro
Intelligence Index
- GPT-3.5 Turbo5.5
- GPT 6 Luna Pro—
GPT-3.5 Turbo: Better than 1% of 326 scored models
Indexes
Coding Index
Composite of the coding evaluations
- GPT-3.5 Turbo: 10.7
- GPT 6 Luna Pro: —
Reasoning and knowledge
GPQA Diamond
Graduate-level science questions
- GPT-3.5 Turbo: 29.7%
- GPT 6 Luna Pro: —
MMLU-Pro
Multi-subject knowledge and reasoning
- GPT-3.5 Turbo: 46.2%
- GPT 6 Luna Pro: —
Math
MATH-500
Competition math problems
- GPT-3.5 Turbo: 44.1%
- GPT 6 Luna Pro: —
Scores from Artificial Analysis, updated Oct 26, 2026.
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
curl https://www.noumen.xyz/api/v1/chat/completions \
-H "Authorization: Bearer $NOUMEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-3.5-turbo",
"messages": [{ "role": "user", "content": "Explain this stack trace." }]
}'import os
from openai import OpenAI
client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
model="openai/gpt-3.5-turbo",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)OpenAI
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