API cost decision in 10 seconds

GPT-5.5 Pro vs Kimi K2 0711

Pick Kimi K2 0711 for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-26T19:08:13Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Kimi K2 0711 for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Kimi K2 0711 is estimated at $1.72 vs $120 for GPT-5.5 Pro, saving $118.28 (98.6% lower).

Cost-first pickKimi K2 0711

Context-first pickGPT-5.5 Pro

Sample savings$118.2898.6%

10x traffic gap$1182.8

GPT-5.5 Pro has more context, but Kimi K2 0711 saves $118.28 on the standard workload. At 10x that traffic, the same price gap is about $1182.8. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Kimi K2 0711 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	GPT-5.5 Pro	Kimi K2 0711
Input-heavy / RAG	5M input + 500K output	Kimi K2 0711	$240	$4
Balanced workload	1M input + 1M output	Kimi K2 0711	$210	$2.87
Output-heavy chatbot	1M input + 5M output	Kimi K2 0711	$930	$12.07

Cheaper input Kimi K2 0711 $30 vs $0.57 / 1M

Kimi K2 0711 is $29.43 cheaper per 1M input tokens (98.1% lower; 52.6x difference).

Cheaper output Kimi K2 0711 $180 vs $2.3 / 1M

Kimi K2 0711 is $177.7 cheaper per 1M output tokens (98.7% lower; 78.3x difference).

Larger context GPT-5.5 Pro 1.05M vs 131.07K

GPT-5.5 Pro has 918.93K more context (8.01x larger).

Sample workload Kimi K2 0711 $120 vs $1.72

Kimi K2 0711 is $118.28 cheaper on the standard workload (98.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

GPT-5.5 Pro Calculating… Estimated API cost

Kimi K2 0711 Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Kimi K2 0711 has the lower input price; Kimi K2 0711 has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Kimi K2 0711 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $120 for GPT-5.5 Pro and $1.72 for Kimi K2 0711.

Best Fit

Choose GPT-5.5 Pro when you care most about larger context window.

Choose Kimi K2 0711 when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Kimi K2 0711 is estimated at $1.72 vs $120 for GPT-5.5 Pro, saving $118.28 (98.6% lower).
Kimi K2 0711 is $118.28 cheaper on the standard workload (98.6% lower).
Kimi K2 0711 is $29.43 cheaper per 1M input tokens (98.1% lower; 52.6x difference).
Kimi K2 0711 is $177.7 cheaper per 1M output tokens (98.7% lower; 78.3x difference).
GPT-5.5 Pro has 918.93K more context (8.01x larger).

Head-to-Head Specs

Feature	GPT-5.5 Pro (OpenAI)	Kimi K2 0711 (MoonshotAI)
Input Price prompt tokens per 1M	$30	$0.57
Completion Price per 1M tokens	$180	$2.3
Sample Workload Cost 1M input + 500K output	$120	$1.72
Context Window	1.05M	131.07K
Release Date	2026-04-24	2025-07-11
Popularity	#122	#140

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Kimi K2 0711	On the standard 1M input plus 500K output workload, Kimi K2 0711 is estimated at $1.72 vs $120 for GPT-5.5 Pro, saving $118.28 (98.6% lower).
High-volume input processing	Kimi K2 0711	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Kimi K2 0711	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.5 Pro	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

gpt-oss-120b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.13.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.

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OpenAI catalog

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MoonshotAI catalog

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GPT-5.5 Pro

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...

Kimi K2 0711

Kimi K2 Instruct is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32 billion active per forward pass. It is optimized for...