OpenAI Platform API API Status, Latency & Hosted LLM Directory (2026)

What is the latency, uptime SLA, and model lineup of OpenAI Platform API?

OpenAI Platform API maintains an average response latency of 260ms TTFT and an operational uptime SLA of 99.95% across its global infrastructure endpoints (us-east-1, us-central1, europe-west1). It currently hosts 9 tracked foundation models including GPT-4o Mini, OpenAI o4-mini, GPT-6.1 Sol, OpenAI o3.

Verified daily via automated API latency tests and official documentation.

Zero-Shot RAG Verified

Average TTFT Latency 260ms P90 Benchmark Window

Historical Uptime SLA 99.95% 30-Day Rolling Telemetry

Regional Deployment

us-east-1 us-central1 europe-west1

Multi-AZ Availability

Models Hosted on OpenAI Platform API (9)

GPT-4o Mini

OpenAI · Edge-Optimized Omni Model

67.2 IVR

Low-latency multimodal model optimized for high-volume customer queries, fine-tuning, and structured extraction.

Input / Out $0.15 / $0.60

Host TTFT 220ms

Throughput 140 t/s

OpenAI o4-mini

OpenAI · Compact RL Reasoning Transformer

63.7 IVR

High-throughput multimodal reasoning model delivering frontier STEM and coding accuracy at a fraction of heavyweight reasoning API costs.

Input / Out $1.10 / $4.40

Host TTFT 680ms

Throughput 125 t/s

GPT-6.1 Sol

OpenAI · Adaptive Reasoning Multimodal Transformer

62.9 IVR

Delivers near-GPT-6 Astra frontier accuracy at one-fifth the token cost with a 95% cache read discount for high-efficiency agentic coding, computer use, and enterprise workflow automation.

Input / Out $2.00 / $10.00

Host TTFT 520ms

Throughput 135 t/s

OpenAI o3

OpenAI · Reinforcement Learning Reasoning Transformer

60.6 IVR

OpenAI's deep reasoning specialist achieving state-of-the-art performance on GPQA Diamond, competitive programming, and visual chain-of-thought.

Input / Out $2.00 / $8.00

Host TTFT 1150ms

Throughput 82 t/s

OpenAI o3-mini

OpenAI · Reasoning Transformer

59.7 IVR

Cost-effective text reasoning model purpose-built for STEM logic, theorem validation, and structured code generation.

Input / Out $1.10 / $4.40

Host TTFT 950ms

Throughput 98 t/s

GPT-5

OpenAI · Unified Omni-Reasoning MoE

59.2 IVR

OpenAI's unified flagship system combining deep test-time reasoning with native multimodal perception and 400k context.

Input / Out $2.50 / $10.00

Host TTFT 340ms

Throughput 105 t/s

GPT-4o

OpenAI · Omni-Modal Transformer

47.6 IVR

Multimodal enterprise baseline combining native text, vision, and audio processing for real-time applications.

Input / Out $2.50 / $10.00

Host TTFT 280ms

Throughput 100 t/s

GPT-6 Astra

OpenAI · Unified Frontier Reasoning Transformer

47.6 IVR

OpenAI's September 2026 flagship reasoning and computer-use foundation model scoring 96.0% on GPQA Diamond with a 1.05M token context window.

Input / Out $10.00 / $50.00

Host TTFT 740ms

Throughput 74 t/s

o1

OpenAI · Reasoning RL Transformer

37.2 IVR

First-generation heavyweight reasoning model engineered for academic research, complex mathematics, and deep multimodal analysis.

Input / Out $15.00 / $60.00

Host TTFT 2600ms

Throughput 48 t/s

Frequently Asked Questions About OpenAI Platform API

What is the average latency and uptime SLA of OpenAI Platform API?

OpenAI Platform API delivers an average Time to First Token (TTFT) latency of 260ms and a verified 30-day rolling uptime SLA of 99.95%.

Which AI models are available on OpenAI Platform API?

OpenAI Platform API hosts 9 tracked LLMs on InferenceRate: GPT-4o Mini, OpenAI o4-mini, GPT-6.1 Sol, OpenAI o3, OpenAI o3-mini, GPT-5, GPT-4o, GPT-6 Astra, o1.

Which cloud regions does OpenAI Platform API support?

OpenAI Platform API supports API inference deployments across us-east-1, us-central1, europe-west1.