OpenAI

GPT-5.5 Instant

Vérifié par l’équipe de recherche de GetInfoUsDernière révision : October 2026Politique éditoriale
Modèle Léger et ÉconomiqueOfficial Source Verified ↗
65
Intelligence Index

GPT-5.5 Instant de OpenAI est un modèle d’IA conçu pour une efficacité économique maximale par token et une exécution légère à grande échelle, offrant une fenêtre de contexte de 400K, une vitesse de 168 tokens/s, un indice d’intelligence de 65/100 et un tarif de $0.75/$6 par million de tokens.

Technical Specifications

Provider
OpenAI
Category
lightweight
Release Date
2026-05
Knowledge Cutoff
December 2025
Architecture
Low-latency compact reasoning model
Parameters
Confidential
Context Window
400K tokens
Max Output
128K tokens
Cached Input Price
$0.075 / 1M tokens
Batch API Discount
50% off async batch
Consumer Subscription
$20 / month
Reasoning Mode
Yes (Chain-of-Thought)
Reasoning Effort Control
Configurable (Low / Med / High)
Tool Calling
Yes
Structured Outputs
Yes
Open Weights
No (Proprietary Cloud)
Input Modalities
text, vision
Output Modalities
text
Official Documentation
Visit Official Docs ↗

Data Privacy, Licensing & Deployment Governance

API Data Training Policy
API payloads are excluded from model training by default
Model License & Commercial Rights
Proprietary Commercial API (OpenAI Terms)
Deployment & Cloud Availability
OpenAI Platform API, Microsoft Azure OpenAI Foundry
Output Ownership
Full commercial ownership of generated outputs

Official Provider Release Intelligence, API Quotas & Agentic Specs

Compare Multi-Models Side-by-Side →
Official API Model ID (SDK String)
gpt-5-5-instant
Supported SDK & API Protocol
OpenAI Responses API & Chat Completions v1
Lifecycle & Deprecation Status
Active GA (Guaranteed support through 2028+)
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 ($0.75/1M in) across full 400K window
Prompt Cache Write & TTL Policy
Automatic prefix caching at $0.075/1M (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)
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
Engineering & Pricing Workbench

GPT-5.5 Instant Cost, Context, Hardware & API Integration

500 / day
4,000 tok
1,000 tok
Conversation Depth (History Re-billing):1 Turn (Single-Shot)
50%
Estimated Monthly API Cost (30 Days)
$114.75$135.00
Monthly Savings: $20.25 (Caching/Batch)
Subscription ($20/mo) vs API

For single-user chat, a $20/mo subscription caps your bill below this API volume.

Break-even point: ~87 requests/day equals $20/month.

Same Monthly Workload Cost Across Popular Reference Models

GPT-5.5 Instant (Active)
$114.75
/ month
Gemini 2.5 Flash
$18.00
/ month
DeepSeek V3
$32.70
/ month
GPT-4o
$300.00
/ month
Claude 3.7 Sonnet
$405.00
/ month

Live Prompt Paste Tokenizer & Cost Counter

Paste real system instructions, JSON schemas, or code to measure BPE token counts across tokenizers.

Chars / Words
175 / 24
OpenAI o200k
~46 tok
Claude BPE
~49 tok
Llama / DeepSeek
~51 tok

Hybrid Prompt Routing Cascade Simulator

Route routine queries to a fast lightweight model ($0.15/1M) and escalate only complex reasoning turns to GPT-5.5 Instant:

Cascaded Monthly Bill:$42.19/mo
Saves $72.56/mo (63% cost reduction) vs sending 100% of traffic to GPT-5.5 Instant.

Benchmark Scores & 6-Axis Capability Radar

Benchmark Encyclopedia
Coding (86)Reasoning (86)Knowledge (87)Speed (100)Context (85)Cost Value (72)
GPT-5.5 Instant2026 Frontier Median
SWE-bench Verified
74.5%
GPQA Diamond
75%
MMLU-Pro
87.2%
HumanEval
95%
Humanity's Last Exam
13.6%
Terminal-Bench
49%
SciCode
45.5%
LiveCodeBench
73.5%
AIME
92.4%
Long-Context Reasoning
81.5%
Chatbot Arena Elo
1396pts

Strengths

  • Fenêtre de contexte de 400K et capacité de sortie maximale de 128K tokens (SWE-bench Verified 74.5% · GPQA Diamond 75%)
  • Débit rapide de 168 tokens/seconde avec une latence au premier token (TTFT) de 780 ms
  • Tarification API optimisée ($0.75/$6 par million de tokens) avec prise en charge du cache de prompts et des schémas JSON stricts

Limitations & Trade-offs

  • Modèle cloud propriétaire ne permettant pas le téléchargement local des poids sur serveur isolé
  • Sur les problèmes de recherche fondamentale très complexes, les modèles de raisonnement lourd restent supérieurs

Editorial Assessment

Alliant un indice d’intelligence de 65/100, un contexte de 400K et un débit de 168 tok/s, GPT-5.5 Instant s’impose comme une valeur sûre de la gamme OpenAI.

Best for: Conçu pour une efficacité économique maximale par token et une exécution légère à grande échelle, l’intégration RAG et les pipelines de production évolutifs.

Frequently Asked Questions about GPT-5.5 Instant

How much does the GPT-5.5 Instant API cost per 1M tokens?+

GPT-5.5 Instant by OpenAI is priced at $0.75 per 1M input tokens and $6 per 1M output tokens. With prompt caching enabled, cached input tokens cost $0.075 per 1M tokens, and asynchronous Batch API requests receive a 50% discount.

Should I use a $20/month subscription or the GPT-5.5 Instant 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-5.5 Instant's context window?+

GPT-5.5 Instant features a 400K tokens context window, which equals approximately 300,000 English words or ~800 standard single-spaced pages in a single prompt. Its maximum output generation per turn is 128,000 tokens.

Can I run GPT-5.5 Instant locally on my own GPU (Open Weights)?+

No, GPT-5.5 Instant 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-5.5 Instant 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-5.5 Instant perform on coding and reasoning benchmarks?+

GPT-5.5 Instant achieves a composite Intelligence Index of 65/100, scoring 74.5% on SWE-bench Verified, 75% on GPQA Diamond, 87.2% on MMLU-Pro, and 1396 pts on Chatbot Arena Elo.

What is GPT-5.5 Instant best used for?+

GPT-5.5 Instant is best suited for: Conçu pour une efficacité économique maximale par token et une exécution légère à grande échelle, l’intégration RAG et les pipelines de production évolutifs.. Assessment: Alliant un indice d’intelligence de 65/100, un contexte de 400K et un débit de 168 tok/s, GPT-5.5 Instant s’impose comme une valeur sûre de la gamme OpenAI.

Les scores de benchmarks, tarifs par token et limites évoluent rapidement. Vérifiez toujours les spécifications actuelles sur la documentation officielle du fournisseur.

Sources: OpenAI Official Pricing & Technical Reports (Late 2026)↗