OpenAI の GPT-4o は、自然な音声合成（TTS）、リアルタイム音声対話、高精度な文字起こし向けに設計されたAIモデルです。128K のコンテキストウィンドウ、毎秒 105 トークンの生成速度、知能指数 41/100（1Mトークンあたり入力$2.5・出力$10）を実現しています。
Technical Specifications
- Provider
- OpenAI
- Category
- flagship
- Release Date
- 2024-05
- Batch API Discount
- 50% off async batch
- Consumer Subscription
- $20 / month
- Reasoning Effort Control
- Fixed
- Structured Outputs
- Yes
- Output Modalities
- text, audio
- Official Documentation
- Visit Official Docs ↗
Data Privacy, Licensing & Deployment Governance
Official Provider Release Intelligence, API Quotas & Agentic Specs
- Official API Model ID (SDK String)
- gpt-4o
- Supported SDK & API Protocol
- OpenAI Responses API & Chat Completions v1
- Lifecycle & Deprecation Status
- Legacy Stable (Upgrade path available in OpenAI lineup)
- Production Rate Limits (RPM & TPM)
- 10,000 – 30,000 RPM (Tier 5 Enterprise) · 800,000 – 2,000,000 TPM
- Long-Context Pricing Tier (>128K / >200K)
- Flat rate ($2.5/1M in) across full 128K window
- Prompt Cache Write & TTL Policy
- Automatic prefix caching at $1.25/1M (no extra cache-write fee)
- Computer Use & Browser GUI Agent
- Supported (Screen coordinate grounding, browser & desktop GUI action loops)
- MCP & Parallel Tool Calling
- Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema
- Web Search Grounding & Code Sandbox
- Native Web Search tool + Hosted Code Interpreter & File Search RAG
- Fine-Tuning & Distillation Support
- Supervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT)
- Multimodal Tokenization Billing
- Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile) · Audio (~25–32 tokens/sec)
- Weights Precision & Quantization
- Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster)
- Minimum GPU VRAM Requirement
- Zero Local VRAM Required (100% Serverless Cloud API)
- Supported Inference Engines
- Managed OpenAI Cloud API
- System Card & Safety Framework
- OpenAI Preparedness Framework Audited & System Card Published
- Enterprise Compliance (SOC2 / HIPAA / ZDR)
- SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier
GPT-4o Cost, Context, Hardware & API Integration
For single-user chat, a $20/mo subscription caps your bill below this API volume.
Break-even point: ~38 requests/day equals $20/month.
Same Monthly Workload Cost Across Popular Reference Models
Live Prompt Paste Tokenizer & Cost Counter
Paste real system instructions, JSON schemas, or code to measure BPE token counts across tokenizers.
Hybrid Prompt Routing Cascade Simulator
Route routine queries to a fast lightweight model ($0.15/1M) and escalate only complex reasoning turns to GPT-4o:
Benchmark Scores & 6-Axis Capability Radar
- SWE-bench Verified
- 38.8%
- GPQA Diamond
- 53.6%
- MMLU-Pro
- 72.6%
- HumanEval
- 90.2%
- Humanity's Last Exam
- 4.1%
- Terminal-Bench
- 18.5%
- SciCode
- 27.3%
- LiveCodeBench
- 43.9%
- AIME
- 29.7%
- Long-Context Reasoning
- 58.2%
- Chatbot Arena Elo
- 1286pts
Strengths
- 128K のコンテキストウィンドウと最大 16K トークンの出力容量（SWE-bench Verified 38.8% · GPQA Diamond 53.6%）
- 毎秒 105 トークンの高速スループットと、初回トークン到達時間（TTFT）わずか 410ms の低遅延
- 優れたAPI経済性（1Mトークンあたり入力$2.5・出力$10）に加え、プロンプトキャッシュや構造化JSON出力・関数呼び出しに完全対応
Limitations & Trade-offs
- クラウド専用のプロプライエタリモデルのため、モデル重みをダウンロードしてオフライン実行することはできません
- 大量のトークンを処理する本番環境では、プロンプトキャッシュや Batch API の併用によるコスト最適化が推奨されます
Editorial Assessment
知能指数 41/100、128K コンテキスト、毎秒 105 トークンの速度を兼ね備えた GPT-4o は、OpenAI のラインナップにおいて非常に実用性の高い主力モデルです。
Best for: 自然な音声合成（TTS）、リアルタイム音声対話、高精度な文字起こし、エンタープライズRAG基盤、スケーラブルな本番API統合に最適。
Compare GPT-4o
Frequently Asked Questions about GPT-4o
How much does the GPT-4o API cost per 1M tokens?+
GPT-4o by OpenAI is priced at $2.5 per 1M input tokens and $10 per 1M output tokens. With prompt caching enabled, cached input tokens cost $1.25 per 1M tokens, and asynchronous Batch API requests receive a 50% discount.
Should I use a $20/month subscription or the GPT-4o pay-as-you-go API?+
A flat $20/month consumer subscription is predictable for daily interactive chat and manual coding. However, if you are building software, running automated workflows, or sending low-to-moderate volume with prompt caching enabled, the pay-as-you-go API is typically far more cost-effective and offers higher rate limits without manual UI caps.
How many words and pages fit in GPT-4o's context window?+
GPT-4o features a 128K tokens context window, which equals approximately 96,000 English words or ~256 standard single-spaced pages in a single prompt. Its maximum output generation per turn is 16,384 tokens.
Can I run GPT-4o locally on my own GPU (Open Weights)?+
No, GPT-4o is a proprietary closed-weights model hosted by OpenAI. It cannot be downloaded for local GPU execution and must be accessed via OpenAI's official API or cloud platform.
Does OpenAI train on data sent to the GPT-4o API, and is commercial use allowed?+
API payloads are excluded from model training by default. License tier: Proprietary Commercial API (OpenAI Terms). Full commercial ownership of generated outputs. Supported deployment channels include: OpenAI Platform API, Microsoft Azure OpenAI Foundry.
How does GPT-4o perform on coding and reasoning benchmarks?+
GPT-4o achieves a composite Intelligence Index of 41/100, scoring 38.8% on SWE-bench Verified, 53.6% on GPQA Diamond, 72.6% on MMLU-Pro, and 1286 pts on Chatbot Arena Elo.
What is GPT-4o best used for?+
GPT-4o is best suited for: 自然な音声合成（TTS）、リアルタイム音声対話、高精度な文字起こし、エンタープライズRAG基盤、スケーラブルな本番API統合に最適。. Assessment: 知能指数 41/100、128K コンテキスト、毎秒 105 トークンの速度を兼ね備えた GPT-4o は、OpenAI のラインナップにおいて非常に実用性の高い主力モデルです。
OpenAI Family Lineage, Routing Tiers & Upgrade Path
Step down to a lighter sibling for high-volume routing or step up to OpenAI's flagship reasoning tier:
GPT-6 Astra
GPT-6.1 Sol
GPT-6 Sol
GPT-6 Luna
GPT-5.6 Sol
GPT-5.6 Terra
AI Glossary & Architecture Concepts
View full glossary →Key machine learning concepts and benchmarks relevant to GPT-4o:
The basic unit of text that a language model processes, typically representing about 3 to 4 English characters or roughly 0.75 words. For example, the sentence "Artificial intelligence is fast" breaks down into about 5 tokens.
A standardized evaluation suite used to objectively measure and rank an AI model's capabilities across specific tasks — such as SWE-bench Verified for software engineering, AIME for competitive math, or MMLU for general knowledge.
The maximum number of tokens a model can consider at once — both the input it reads and the output it writes. A 1,000,000-token context window can hold roughly 750,000 English words in a single request.
The ability of a language model to recognize when an external capability is needed and output structured JSON arguments to invoke external APIs, databases, or terminal commands. The runtime executes the tool and passes results back to the model.
An open standard created by Anthropic that allows AI applications and agents to connect seamlessly to local filesystems, development environments, and third-party APIs via standardized server interfaces.
A cost and latency optimization where inference providers store pre-computed attention states for repeated prompt prefixes. Reusing cached tokens typically slashes API input costs by 50% to 90% and cuts TTFT substantially.
Benchmark scores, token prices, and rate limits evolve rapidly as AI labs release model updates. Always verify current specifications and pricing on the official provider documentation.