Which is better for coding — GPT-5.1 Instant or LongCat-Flash-Chat?

Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.

Which model is cheaper — GPT-5.1 Instant or LongCat-Flash-Chat?

API pricing data is available on the individual model pages.

Which has a larger context window — GPT-5.1 Instant or LongCat-Flash-Chat?

Context window data is available on the individual model pages.

GPT-5.1 Instant vs LongCat-Flash-Chat: Specs & Benchmark Comparison

Characteristic	GPT-5.1 Instant	LongCat-Flash-Chat
Company	OpenAI	Meituan
Release Date	November 11, 2025	August 28, 2025
Parameters	—	560B
Multimodal	Yes	No
Context (input)	256K	—
Context (output)	32K	—
Input Price / 1M	$0.30	—
Output Price / 1M	$1.20	—
Average Score	0.9	0.9
Benchmarks
GPQA	0.9	0.7

Visual Benchmark Comparison

GPT-5.1 Instant

LongCat-Flash-Chat

GPQA0.9 vs 0.7

0.9

0.7

Verdict

GPT-5.1 Instant leads in 1 out of 2 comparison categories.

Overall Performance

Both models show comparable average scores: GPT-5.1 Instant — 0.9, LongCat-Flash-Chat — 0.9.

Recency

GPT-5.1 Instant is newer: released 11/11/2025 vs 8/28/2025.

More About These Models

GPT-5.1 Instant

OpenAI — specs, benchmarks, API

LongCat-Flash-Chat

Meituan — specs, benchmarks, API

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GPT-5 Medium vs GPT-5.1 Instant GPT-5.1 Instant vs GPT-5.1 Thinking GPT-5 High vs GPT-5.1 Instant GPT-5.1 Instant vs GPT-5.4 GPT-5.1 Instant vs GPT-5.4 mini GPT-5.1 High vs GPT-5.1 Instant

All model comparisons →

The GPT-5.1 Instant and LongCat-Flash-Chat comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Instant or LongCat-Flash-Chat page. See also the complete list of AI model comparisons.