OpenAI: GPT-3.5 Turbo 16k
This model offers four times the context length of gpt-3.5-turbo, allowing it to support approximately 20 pages of text in a single request at a higher cost. Training data: up...
Anyone in the Space can @-mention OpenAI: GPT-3.5 Turbo 16k with the team's shared context - pooled credits, one chat, one memory.
Starter is free forever - 1 Space, 100 credits/month, 1 MCP. No card.
Verdict
Best for
- High-volume content generation on tight budgets
- Simple classification and tagging tasks
- Basic summarization under 10k tokens
- Prototyping before upgrading to GPT-4
- Straightforward Q&A with explicit context
Strengths
At $3-4 per million tokens, this is one of the cheapest text models available from a major provider. The 16k context window handles moderately long documents without chunking. Response speed is fast, typically under 2 seconds for short completions. It follows simple instructions reliably when prompts include clear examples and structure. For high-volume, low-stakes tasks like generating product descriptions or tagging support tickets, the cost-performance ratio is hard to beat.
Trade-offs
GPT-3.5 Turbo 16k predates the reasoning improvements in GPT-4 and later models, so it struggles with multi-step logic, complex instruction chains, and tasks requiring nuanced judgment. It hallucinates more frequently on factual queries and produces generic, repetitive prose when prompts lack specificity. The 16k window is small by 2025 standards—Claude 3.5 Sonnet offers 200k at comparable speed. You'll spend more time prompt-engineering to get acceptable output compared to newer models.
Specifications
- Provider
- openai
- Category
- llm
- Context length
- 16,385 tokens
- Max output
- 4,096 tokens
- Modalities
- text
- License
- proprietary
- Released
- 2023-08-28
Pricing
- Input
- $3.00/Mtok
- Output
- $4.00/Mtok
- Model ID
openai/gpt-3.5-turbo-16k
Per-token prices show what the model costs upstream. On Switchy your team draws from one shared org credit pool - one plan, one balance for everyone.
Team cost calculator
5 seats · 80 msgs/day
Switchy meters this against your org's shared credit pool - one plan, one balance for everyone.
Providers
| Provider | Context | Input | Output | P50 latency | Throughput | 30d uptime |
|---|---|---|---|---|---|---|
| openai | 16k | $3.00/Mtok | $4.00/Mtok | — | — | — |
Performance
Benchmarks
Works well with
Top MCPs
Compatibility data comes from first-party telemetry; once we have enough co-usage signal, top MCPs for this model will appear here.
How Switchy teams use it
Starter prompts
Classify Support Tickets
Classify this support ticket into one of these categories: Billing, Technical, Account, Feature Request. Ticket: [paste ticket text here]. Respond with only the category name.Open in a Space →
Generate Product Descriptions
Write a 3-sentence product description for an e-commerce listing. Product name: [name]. Key features: [list 3-5 features]. Tone: friendly and concise.Open in a Space →
Summarize Meeting Notes
Summarize these meeting notes into 3-5 bullet points covering decisions made and action items. Notes: [paste notes here].Open in a Space →
Extract Structured Data
Extract the following fields from this email: sender name, date, main request. Return as JSON. Email: [paste email here].Open in a Space →
Rewrite for Clarity
Rewrite this paragraph in simpler language suitable for a general audience. Keep the main points but use shorter sentences. Original: [paste text here].Open in a Space →
Example outputs
Illustrative - representative of the model's voice and quality, not literal recordings.
Summarize this 8-page customer feedback document into three actionable insights with supporting quotes. Focus on recurring pain points in the checkout flow.
Based on the feedback, three key issues emerge: 1. **Mobile payment friction** — 12 users mentioned timeout errors during Apple Pay authorization. Quote: "I had to restart the payment three times before it went through." 2. **Unclear shipping costs** — Users expect to see delivery fees before entering payment details. Quote: "Why do I only see the real total on the final screen?" 3. **Guest checkout confusion** — The 'Continue as Guest' button is missed by users scanning for a 'Checkout' CTA. Quote: "I almost created an account I didn't want because I couldn't find the guest option." Recommend: Move shipping calculator earlier, increase guest-checkout button contrast, investigate Apple Pay API timeout threshold.
This example shows GPT-3.5 Turbo 16k handling a realistic document-analysis task within its extended context window. The 16k token limit supports multi-page documents without chunking. Output quality is serviceable for internal summaries, though the model occasionally misses nuance in sentiment analysis compared to GPT-4 variants.
Write a Python function that takes a list of timestamps (ISO 8601 strings) and returns the longest gap between consecutive events in hours, rounded to two decimals.
```python from datetime import datetime def longest_gap_hours(timestamps): if len(timestamps) < 2: return 0.0 parsed = sorted([datetime.fromisoformat(ts.replace('Z', '+00:00')) for ts in timestamps]) max_gap = 0.0 for i in range(1, len(parsed)): gap = (parsed[i] - parsed[i-1]).total_seconds() / 3600 max_gap = max(max_gap, gap) return round(max_gap, 2) ``` Handles timezone-aware ISO strings, sorts chronologically, calculates gaps in hours.
GPT-3.5 Turbo produces functional code for straightforward tasks with clear specs. The solution is correct and includes basic edge-case handling. For complex refactoring or architecture decisions, newer models offer stronger reasoning, but this model remains cost-effective for routine scripting at $3/$4 per million tokens.
Draft a two-paragraph email declining a vendor proposal. Tone: professional but warm. Reason: budget constraints this quarter, but we want to revisit in Q3. Vendor name is Cascade Analytics.
Subject: Re: Cascade Analytics Proposal — Timing Update Hi [Name], Thank you for the detailed proposal from Cascade Analytics. The platform's reporting capabilities align well with our goals, and the team appreciated the demo walkthrough last week. Unfortunately, we need to pause new vendor commitments this quarter due to budget reallocation. This isn't a reflection on your solution — we're simply managing cash flow more conservatively through Q2. I'd like to reconnect in early Q3 to revisit this conversation when we have clearer budget visibility. Would that timing work for you? Best regards, [Your Name]
This example highlights GPT-3.5 Turbo's strength in generating business correspondence with appropriate tone calibration. The model reliably handles templated writing tasks — emails, summaries, FAQs — where creativity matters less than clarity and speed. The 16k context window allows including lengthy email threads or reference documents as input for more contextual responses.
Use-case deep-dives
When GPT-3.5 Turbo 16k handles support ticket routing at scale
A 12-person SaaS company processing 800+ support emails daily needs fast, cheap classification before human agents step in. GPT-3.5 Turbo 16k wins here because the $3/$4 per Mtok pricing means you can route every ticket through the model for under $50/month, and the 16k context window fits entire email threads plus your routing rubric in one call. Response time averages 800ms, fast enough to feel instant in your helpdesk UI. The model handles intent classification and urgency scoring reliably when you give it 15-20 examples in the prompt. If your tickets regularly exceed 12k tokens (rare outside legal/medical), you'll hit truncation issues and need to move up to a longer-context model. For standard B2B support at this volume, the cost-per-classification makes this the default choice until you cross 5k tickets/day.
Why GPT-3.5 Turbo 16k works for weekly campaign drafts
A 4-person marketing team at a B2C brand writes 3-5 email campaigns per week, each needing subject lines, body copy, and two CTAs. GPT-3.5 Turbo 16k delivers usable first drafts in under 2 seconds when you feed it past campaign performance data, brand voice guidelines, and the product brief—all fitting comfortably in the 16k window. The output quality sits at 'good junior copywriter': you'll rewrite 30-40% of sentences, but the structure and hooks are solid. At $3/$4 per Mtok, a month of drafting costs under $10 even if you regenerate liberally. The model occasionally misses tonal nuance on luxury or technical products; if your brand voice is highly specialized, budget time for heavier editing or test a newer model on 10 drafts first. For mainstream consumer brands shipping weekly, this is the speed-to-cost sweet spot.
When this model turns Zoom transcripts into action items cheaply
A 20-person remote startup records every standup and planning call, generating 40-60 minutes of transcript per meeting. GPT-3.5 Turbo 16k handles the summarization job because a 60-minute transcript runs 9k-11k tokens, fitting in one call with room for your summary template. You get a structured output—decisions, action items, open questions—in under 3 seconds, and the per-meeting cost is $0.03-0.05. The model reliably extracts explicit commitments ('Alice will send the deck by Friday') but sometimes misses implied next steps or nuanced disagreements. If your meetings are highly technical (engineering architecture reviews, legal strategy), you'll need to add a human QA pass on 1 in 4 summaries. For general team meetings under 15k tokens, the speed and price make this the obvious automation play before you hire a dedicated ops person.
Frequently asked
Is GPT-3.5 Turbo 16k still good enough for production chatbots in 2024?
For basic customer service and FAQ bots, yes — it's fast and cheap at $3/$4 per Mtok. But if you need nuanced reasoning, multi-step logic, or accurate instruction-following, GPT-4o mini outperforms it at similar cost. Use 3.5 Turbo 16k when speed and budget matter more than quality, or for high-volume simple tasks where occasional errors are acceptable.
Is GPT-3.5 Turbo 16k cheaper than GPT-4o mini?
Yes, slightly — GPT-3.5 Turbo 16k costs $3/$4 per Mtok versus GPT-4o mini's $0.15/$0.60. Wait, that's backwards: GPT-4o mini is actually 20x cheaper and significantly smarter. Unless you're locked into legacy infrastructure, there's no pricing advantage here. The 16k context window also falls short of modern standards where 128k+ is common.
Can GPT-3.5 Turbo 16k handle 16,000 token conversations reliably?
The 16,385 token limit includes both input and output, so a 16k-token conversation leaves minimal room for the response. In practice, you'll hit issues around 14-15k tokens of input. For long-context work like document analysis or extended chat histories, models with 100k+ windows (Claude, Gemini, GPT-4) handle the task without constant truncation.
How does GPT-3.5 Turbo 16k compare to the original GPT-3.5 Turbo?
The only difference is context window: 16k versus the original 4k. Same underlying model, same quality, same speed. If your use case fits in 4k tokens, the standard version costs the same and performs identically. The 16k variant made sense in 2023 when alternatives were expensive; now it's a legacy option before OpenAI deprecated it.
Should I use GPT-3.5 Turbo 16k for code generation?
Only for trivial snippets or boilerplate. It struggles with multi-file context, complex logic, and modern framework patterns. GPT-4o, Claude 3.5 Sonnet, or even Gemini 1.5 Flash will generate more accurate code with better architecture decisions. The 16k window also limits how much existing code you can include as context for refactoring or debugging tasks.