GPT-5.1 vs GPT Chat Latest
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose GPT-5.1 if you need
- ✓Choose GPT-5.1 if you need lower output cost at $10 per million tokens.
- ✓Choose GPT-5.1 if you need documented output speed of 115.83 t/s.
- ✓Choose GPT-5.1 if you need a reported intelligence_index of 27.4.
- ✓Choose GPT-5.1 if you need strong multimodal integration for images, text, and files.
Choose GPT Chat Latest if you need
- ✓Choose GPT Chat Latest if you need flexible performance across creative and analytical tasks.
- ✓Choose GPT Chat Latest if you need natural multi-turn dialogue.
- ✓Choose GPT Chat Latest if you need strong handling of extended documents.
- ✓Choose GPT Chat Latest if you need seamless text, image, and file input processing.
Verdict
GPT-5.1 leads on measurable efficiency with a known intelligence_index of 27.4, output speed of 115.83 t/s, and half the price at $10/1M tokens versus GPT Chat Latest at $30/1M. Both share identical 400k context and multimodal text/image/file support from OpenAI, but GPT Chat Latest emphasizes flexible multi-turn dialogue and extended document handling where GPT-5.1 highlights native integration. GPT-5.1 wins on verifiable specs while GPT Chat Latest remains stronger on unquantified qualitative strengths.
GPT-5.1 vs GPT Chat Latest: side by side
| Spec | GPT-5.1 | GPT Chat Latest | Winner |
|---|---|---|---|
| Intelligence | 27.4 | — | Tie |
| Output speed | 116 t/s | — | Tie |
| Output price | $10.00/1M | $30.00/1M | GPT-5.1 |
| Context | 400K | 400K | Tie |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | OpenAI | Tie |
Detailed analysis
Pricing
Winner: GPT-5.1GPT-5.1 costs $10 per million output tokens while GPT Chat Latest costs $30 per million. Both are proprietary OpenAI models with the same 400k context window. This makes GPT-5.1 the lower-cost option based on the listed prices.
Speed
Winner: GPT-5.1GPT-5.1 lists a specific output speed of 115.83 tokens per second. GPT Chat Latest provides no speed figure. Both note potential latency risks with maximum context usage.
Intelligence
Winner: GPT-5.1GPT-5.1 reports an intelligence_index of 27.4. GPT Chat Latest lists no intelligence_index value. Performance details for GPT-5.1 are noted as unverified beyond specs.
Multimodal Capabilities
Winner: TieBoth models support native processing of text, images, and files with 400k context. GPT-5.1 emphasizes strong multimodal integration while GPT Chat Latest highlights seamless handling and flexibility. Neither supports audio or video.
GPT-5.1
Pros
- +Very large context window
- +Native support for images, text, and files
- +Strong multimodal integration
Cons
- –No audio or video modalities
- –Performance details unverified beyond specs
- –Potential latency with maximum context
GPT Chat Latest
Pros
- +Seamless handling of text, image, and file inputs
- +Strong performance on extended documents
- +Flexible across creative and analytical tasks
- +Natural multi-turn dialogue
Cons
- –Can still hallucinate facts or details
- –Large context increases cost and latency
- –No native real-time external tool access
Summary: GPT-5.1 vs GPT Chat Latest
Select GPT-5.1 when verifiable metrics for cost, speed, and intelligence matter most. Choose GPT Chat Latest when unquantified strengths in dialogue and task flexibility are priorities. Both share core context and modality specs from the same provider.
Frequently asked questions
GPT-5.1 at $10 per million output tokens versus GPT Chat Latest at $30 per million.