API cost decision in 10 seconds

GPT-5.5 Pro vs GLM 4.7 Flash

Pick GLM 4.7 Flash for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T12:43:06Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GLM 4.7 Flash 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, GLM 4.7 Flash is estimated at $0.26 vs $120 for GPT-5.5 Pro, saving $119.74 (99.8% lower).

Cost-first pickGLM 4.7 Flash

Context-first pickGPT-5.5 Pro

Sample savings$119.7499.8%

10x traffic gap$1197.4

GPT-5.5 Pro has more context, but GLM 4.7 Flash saves $119.74 on the standard workload. At 10x that traffic, the same price gap is about $1197.4. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GLM 4.7 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	GPT-5.5 Pro	GLM 4.7 Flash
Input-heavy / RAG	5M input + 500K output	GLM 4.7 Flash	$240	$0.5
Balanced workload	1M input + 1M output	GLM 4.7 Flash	$210	$0.46
Output-heavy chatbot	1M input + 5M output	GLM 4.7 Flash	$930	$2.06

Cheaper input GLM 4.7 Flash $30 vs $0.06 / 1M

GLM 4.7 Flash is $29.94 cheaper per 1M input tokens (99.8% lower; 500x difference).

Cheaper output GLM 4.7 Flash $180 vs $0.4 / 1M

GLM 4.7 Flash is $179.6 cheaper per 1M output tokens (99.8% lower; 450x difference).

Larger context GPT-5.5 Pro 1.05M vs 202.75K

GPT-5.5 Pro has 847.25K more context (5.18x larger).

Sample workload GLM 4.7 Flash $120 vs $0.26

GLM 4.7 Flash is $119.74 cheaper on the standard workload (99.8% 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

GLM 4.7 Flash 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

GLM 4.7 Flash has the lower input price; GLM 4.7 Flash has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, GLM 4.7 Flash 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 $0.26 for GLM 4.7 Flash.

Best Fit

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

Choose GLM 4.7 Flash 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, GLM 4.7 Flash is estimated at $0.26 vs $120 for GPT-5.5 Pro, saving $119.74 (99.8% lower).
GLM 4.7 Flash is $119.74 cheaper on the standard workload (99.8% lower).
GLM 4.7 Flash is $29.94 cheaper per 1M input tokens (99.8% lower; 500x difference).
GLM 4.7 Flash is $179.6 cheaper per 1M output tokens (99.8% lower; 450x difference).
GPT-5.5 Pro has 847.25K more context (5.18x larger).

Head-to-Head Specs

Feature	GPT-5.5 Pro (OpenAI)	GLM 4.7 Flash (Z.ai)
Input Price prompt tokens per 1M	$30	$0.06
Completion Price per 1M tokens	$180	$0.4
Sample Workload Cost 1M input + 500K output	$120	$0.26
Context Window	1.05M	202.75K
Release Date	2026-04-24	2026-01-19

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	GLM 4.7 Flash	On the standard 1M input plus 500K output workload, GLM 4.7 Flash is estimated at $0.26 vs $120 for GPT-5.5 Pro, saving $119.74 (99.8% lower).
High-volume input processing	GLM 4.7 Flash	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	GLM 4.7 Flash	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 Multi-Agent offers 2M context with $5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.

Popular competitors

DeepSeek V4 Flash · DeepSeek · #1
Hy3 preview · Tencent · #2
Claude Opus 4.7 · Anthropic · #3
Claude Sonnet 4.6 · Anthropic · #4

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

OpenAI catalog

Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.

Open OpenAI models

Z.ai catalog

Check other Z.ai models with comparable pricing, context, or release timing.

Open Z.ai models

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...

GLM 4.7 Flash

As a 30B-class SOTA model, GLM-4.7-Flash offers a new option that balances performance and efficiency. It is further optimized for agentic coding use cases, strengthening coding capabilities, long-horizon task planning,...