API cost decision in 10 seconds

NewGPT-6 Sol Pro vs GLM 5.2

Pick GLM 5.2 for lower cost; pick GPT-6 Sol Pro only if the larger context window matters more.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GLM 5.2 for lower cost; pick GPT-6 Sol Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, GLM 5.2 is estimated at $1.67 vs $7 for GPT-6 Sol Pro, saving $5.33 (76.1% lower).

Cost-first pickGLM 5.2
Context-first pickGPT-6 Sol Pro
Sample savings$5.3376.1%
10x traffic gap$53.3

GPT-6 Sol Pro has more context, but GLM 5.2 saves $5.33 on the standard workload. At 10x that traffic, the same price gap is about $53.3. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GLM 5.2 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-6 Sol ProGLM 5.2
Input-heavy / RAG 5M input + 500K output GLM 5.2 $15 $4.27
Balanced workload 1M input + 1M output GLM 5.2 $12 $2.69
Output-heavy chatbot 1M input + 5M output GLM 5.2 $52 $10.86
Cheaper inputGLM 5.2$2 vs $0.65 / 1M
Cheaper outputGLM 5.2$10 vs $2.04 / 1M
Larger contextGPT-6 Sol Pro1.05M vs 1.05M
Sample workloadGLM 5.2$7 vs $1.67

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-6 Sol ProCalculating…Estimated API cost
GLM 5.2Calculating…Estimated API cost
Cheaper for this workloadCalculating…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 5.2 has the lower input price, GLM 5.2 has the lower output price, and GPT-6 Sol Pro offers the larger context window.

For a 1M input token plus 500K output token workload, the estimated API cost is $7 for GPT-6 Sol Pro and $1.67 for GLM 5.2.

Best Fit

Choose GPT-6 Sol Pro when you care most about larger context window.

Choose GLM 5.2 when you care most about lower input-token price, and lower output-token price.

Head-to-Head Specs
FeatureNewGPT-6 Sol Pro
(OpenAI)		GLM 5.2
(Z.ai)
Input Price
prompt tokens per 1M		$2$0.65
Completion Price
per 1M tokens		$10$2.04
Sample Workload Cost
1M input + 500K output		$7$1.67
Context Window1.05M1.05M
Release Date2026-09-222026-06-16
GPT-6 Sol Pro

GPT-6 Sol Pro is the same underlying model as [GPT-6 Sol](https://openrouter.ai/openai/gpt-6-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

GLM 5.2

GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level software engineering,...

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGLM 5.2On the standard 1M input plus 500K output workload, GLM 5.2 is estimated at $1.67 vs $7 for GPT-6 Sol Pro, saving $5.33 (76.1% lower).
High-volume input processingGLM 5.2Lower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsGLM 5.2Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-6 Sol ProA larger context window leaves more room for retrieved passages and source files.