GPT-5.5 Pro vs Llama 3.1 8B (Cerebras): API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for GPT-5.5 Pro (OpenAI) and Llama 3.1 8B (Cerebras) (Cerebras). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Apr 30, 2026
Interactive Cost Calculator
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Showing costs for 2 models. Cheapest: Llama 3.1 8B (Cerebras) at $1.50/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestLlama 3.1 8B (Cerebras) | Cerebras | $1.50 | $0.000150 | $1.00 | $0.50 | 99.9% | Alerts coming soon |
GPT-5.5 Pro | OpenAI | $1,200.00 | $0.120000 | $300.00 | $900.00 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | GPT-5.5 Pro | Llama 3.1 8B (Cerebras) | Cheaper |
|---|---|---|---|
| Input (standard) | $30.00/M | $0.10/M | Llama 3.1 8B (Cerebras) |
| Output | $180.00/M | $0.10/M | Llama 3.1 8B (Cerebras) |
Prices last verified: 2026-03-10 – 2026-04-30
Cost Breakdown by Usage Volume
Estimated monthly costs at different request volumes, assuming 1,000 input tokens and 500 output tokens per request. Adjust in the calculator above for your specific use case.
| Volume | GPT-5.5 ProMonthly | Llama 3.1 8B (Cerebras)Monthly | GPT-5.5 ProPer request | Llama 3.1 8B (Cerebras)Per request |
|---|---|---|---|---|
| 1K requests/mo | $120.00 | $0.15 | $0.120000 | $0.000150 |
| 10K requests/mo | $1,200.00 | $1.50 | $0.120000 | $0.000150 |
| 100K requests/mo | $12,000.00 | $15.00 | $0.120000 | $0.000150 |
| 1M requests/mo | $120,000.00 | $150.00 | $0.120000 | $0.000150 |
Green values indicate the lower-cost option at each volume tier. Cost per request is calculated at 1,000 input + 500 output tokens using standard (non-batch, non-cached) pricing.
Price History
Input price per 1M tokensWhen to Choose GPT-5.5 Pro
by OpenAI
- General chatbot
Input / 1M tokens
$30.00/M
Output / 1M tokens
$180.00/M
Context window
1,050,000
Tier
premium
When to Choose Llama 3.1 8B (Cerebras)
by Cerebras
- Customer support
- Text classification
- General chatbot
Input / 1M tokens
$0.10/M
Output / 1M tokens
$0.10/M
Context window
128,000
Tier
budget
Key Differences Beyond Price
Cost is only one factor in choosing an AI model. Context window size, rate limits, supported features, and latency all affect whether a model fits your use case.
| Capability | GPT-5.5 Pro | Llama 3.1 8B (Cerebras) |
|---|---|---|
| Context window | 1,050,000 tokens | 128,000 tokens |
| Max output tokens | 128,000 tokens | 8,192 tokens |
| Performance tier | Premium | Budget |
| Vision / image input | Yes | No |
| Function calling | Yes | Yes |
| JSON mode | Yes | Yes |
| Prompt caching | No | No |
| Batch API (50% discount) | No | No |
| Extended reasoning | Yes | No |
| Fine-tuning | No | No |
Llama 3.1 8B (Cerebras) notes
Cerebras wafer-scale inference: ~2,200 tokens/sec — roughly 20x faster than GPU providers. Ideal for latency-sensitive real-time applications.
Frequently Asked Questions
Is GPT-5.5 Pro cheaper than Llama 3.1 8B (Cerebras)?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), Llama 3.1 8B (Cerebras) costs $15.00/month versus $12,000.00/month for GPT-5.5 Pro — a 100% saving. Your actual savings will vary based on your token profile; output-heavy workloads amplify differences in output pricing.
Which model has a larger context window, GPT-5.5 Pro or Llama 3.1 8B (Cerebras)?
GPT-5.5 Pro has a larger context window at 1,050,000 tokens, compared to 128,000 tokens for Llama 3.1 8B (Cerebras). A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do GPT-5.5 Pro and Llama 3.1 8B (Cerebras) support the Batch API?
Neither GPT-5.5 Pro nor Llama 3.1 8B (Cerebras) currently supports a batch API with discounted pricing. For batch-eligible alternatives, consider models from OpenAI, Anthropic, or Google that include batch API support.
Which model offers better prompt caching?
Neither GPT-5.5 Pro nor Llama 3.1 8B (Cerebras) currently supports prompt caching. For prompt-caching capable alternatives, consider Claude models from Anthropic or GPT-4o from OpenAI.
What are the best use cases for GPT-5.5 Pro vs Llama 3.1 8B (Cerebras)?
Both models are well-suited for General chatbot. GPT-5.5 Pro is particularly strong for overlapping tasks. Llama 3.1 8B (Cerebras) is favored for Customer support, Text classification. At the same quality level, the lower-cost model is usually preferable; use this page's calculator to compare total monthly spend at your volume.
What is the cost per request for GPT-5.5 Pro vs Llama 3.1 8B (Cerebras)?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — GPT-5.5 Pro costs $0.120000 per request and Llama 3.1 8B (Cerebras) costs $0.000150 per request. At 100,000 requests/month, that translates to $12,000.00 and $15.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
GPT-5.5 Pro vs Llama 3.1 8B (Cerebras): Summary
When comparing GPT-5.5 Pro and Llama 3.1 8B (Cerebras) for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Llama 3.1 8B (Cerebras) offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $15.00/month, compared to $12,000.00/month for GPT-5.5 Pro.
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. GPT-5.5 Pro charges $30.00/M for input tokens and $180.00/M for output tokens. Llama 3.1 8B (Cerebras) charges $0.10/M input and $0.10/M output. If your workload is output-heavy (more tokens generated than consumed as input), the model with the lower output price compounds cost savings significantly at scale.
Context window capacity differs between the two: GPT-5.5 Pro supports up to 1,050,000 tokens in a single request, versus 128,000 tokens for Llama 3.1 8B (Cerebras). A larger context window is essential for document summarization, large codebase analysis, and multi-document retrieval-augmented generation (RAG) applications.
Use the interactive calculator at the top of this page to enter your actual token usage and monthly request volume for a precise cost comparison tailored to your workload. Adjust for batch API discounts and prompt caching to find the most cost-effective option for your specific deployment.
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Relevant Use Cases
See cost recommendations for workloads where GPT-5.5 Pro or Llama 3.1 8B (Cerebras) is recommended.