GPT-5.1 Chat vs GPT-5.4 Image 2
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-5.1 Chat and GPT-5.4 Image 2.
GPT-5.1 Chat
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
GPT-5.4 Image 2
[GPT-5.4](https://openrouter.ai/openai/gpt-5.4) Image 2 combines OpenAI's GPT-5.4 model with state-of-the-art image generation capabilities from GPT Image 2. It enables rich multimodal workflows, allowing users to seamlessly move between reasoning, coding, and...
Technical Specifications
| Specification | GPT-5.1 Chat | GPT-5.4 Image 2 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 128,000 tokens | 272,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-11-13 | 2026-04-21 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.1 Chat
$1.25
GPT-5.4 Image 2
$8.00
Output Price per Million Tokens
GPT-5.1 Chat
$10.00
GPT-5.4 Image 2
$15.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-5.1 Chat Quirks & Gotchas
No developer gotchas reported.
GPT-5.4 Image 2 Quirks & Gotchas
No developer gotchas reported.