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GPT-3.5 Turbo vs DeepSeek V3.1

Detailed technical comparison between GPT-3.5 Turbo (OpenAI) and DeepSeek V3.1 (DeepSeek). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-3.5 Turbo: 0 WinsvsDeepSeek V3.1: 6 Wins
Context Leader

DeepSeek V3.1

163,840 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

DeepSeek V3.1

$0.25 / MTok
OpenAIactive

GPT-3.5 Turbo

GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.

View GPT-3.5 Turbo Full Specs →
DeepSeekactive

DeepSeek V3.1

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

View DeepSeek V3.1 Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-3.5 TurboDeepSeek V3.1
ProviderOpenAIDeepSeek
Context Window16,385 tokens163,840 tokens🏆
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apiself hostable
Production Stabilitystablestable
API AvailableYesYes
Released Date2023-05-282025-08-21

API Pricing Comparison

Input Price per Million Tokens

GPT-3.5 Turbo

$0.50

DeepSeek V3.1

$0.25

Output Price per Million Tokens

GPT-3.5 Turbo

$1.50

DeepSeek V3.1

$0.95

💡 Cost Ratio: DeepSeek V3.1 is 2.0x cheaper per input token than GPT-3.5 Turbo.

Want to test both models live?

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
79.4%vs80.0%+0.6% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆
HumanEvalPython coding & logic synthesis
77.6%vs78.2%+0.6% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆
MATHComplex mathematical problem solving
54.8%vs55.4%+0.6% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆
GPQAGraduate-level expert reasoning
40.2%vs40.8%+0.6% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆
HellaSwagCommonsense reasoning and inference
82.4%vs83.0%+0.6% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆
MT-BenchMulti-turn conversation flow quality
8.5%vs8.6%+0.1% DeepSeek V3.1
GPT-3.5 Turbo
DeepSeek V3.1 🏆

GPT-3.5 Turbo Quirks & Gotchas

No developer gotchas reported.

DeepSeek V3.1 Quirks & Gotchas

No developer gotchas reported.

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