How does prompt caching affect my monthly LLM bill?

Providers like DeepSeek and Anthropic offer up to 90% discounts on prompt tokens that are cached across requests. If you reuse lengthy system instructions across thousands of calls, cached input tokens are billed at a fraction of the normal input price (see the cached price column for each model).

Which LLM provides the best price-to-performance ratio in 2026?

It depends on the task. For high-volume extraction and classification, the cheapest tier (GPT-6 Luna, Gemini 3.1 Flash-Lite, DeepSeek-V4.1 Flash, Claude Haiku 4.5) usually wins; use the comparison table with your own token counts, since prices change often.

Does the AI Prompt Optimizer rewrite my instructions safely?

Yes. The AI Prompt & Budget Optimizer eliminates conversational filler, repetitive guidelines, and verbose markdown, and is instructed to keep your constraints, placeholders, JSON keys and edge cases word for word; the tool warns if a {{placeholder}} goes missing. Always review the rewrite before using it.

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AI LLM Token & Cost Estimator

Calculate exact token counts and live API costs across DeepSeek-V3/R1, OpenAI GPT-4o, Claude 3.7 Sonnet, and Gemini 2.0 Flash. Optimize system prompts to reduce monthly cloud spend.

Instant ResultsNo Sign-up Required100% Free Utility

Input Tokens

~66

39 words · loading tokenizer…

Output Tokens

350

your estimate

Monthly Calls

10,000

projected volume

Cheapest Model

GPT-6 Luna

$1.80/mo

Paste Prompt or Sample Request Text

Tokens are counted in your browser with OpenAI's real o200k_base tokenizer (used by GPT-4o and later OpenAI models). Claude, Gemini and DeepSeek use their own tokenizers, so for those models the count is a close estimate (typically within about 10–20% for English text), not an exact figure.

Expected output tokens per call

02k4k (type more above)

Requests per month

0100k200k (type up to 100M)

Share of input tokens served from cache (%)Use Batch API (50% off where offered; not DeepSeek)

Pricing Comparison (Ranked by Monthly Cost)

Model & Provider	Input / Cached / Output (per 1M)	Single Call	Monthly Cost (10,000)
GPT-6 LunaCheapest OpenAIFast / Cheap Long-context prompts cost more.	In: $0.10 Cached: $0.010 Out: $0.50	$0.00018	$1.80 $0.06 / day
DeepSeek-V4.1 Flash DeepSeekFast / Cheap≈ token estimate Peak-hour price; off-peak hours are 50% cheaper.	In: $0.30 Cached: $0.006 Out: $1.20	$0.00043	$4.34 $0.14 / day
Gemini 3.1 Flash-Lite GoogleFast / Cheap≈ token estimate	In: $0.25 Cached: $0.025 Out: $1.50	$0.00054	$5.37 $0.18 / day
Gemini 3.8 Flash GoogleBalanced≈ token estimate Introductory price until 31 Dec 2026; doubles from 1 Jan 2027.	In: $0.75 Cached: $0.075 Out: $3.75	$0.00135	$13.49 $0.45 / day
DeepSeek-V4 Pro DeepSeekBalanced≈ token estimate Peak-hour price; off-peak hours are 50% cheaper.	In: $1.32 Cached: $0.044 Out: $3.96	$0.00145	$14.48 $0.48 / day
Claude Haiku 4.5 AnthropicFast / Cheap≈ token estimate	In: $1.00 Cached: $0.100 Out: $5.00	$0.00180	$17.98 $0.60 / day
GPT-6 Sol OpenAIBalanced Long-context prompts cost more.	In: $2.00 Cached: $0.200 Out: $10.00	$0.00360	$35.96 $1.20 / day
Claude Sonnet 5.5 AnthropicBalanced≈ token estimate	In: $2.00 Cached: $0.200 Out: $10.00	$0.00360	$35.96 $1.20 / day
Gemini 3.1 Pro (Preview) GoogleFlagship≈ token estimate Prompts over 200k tokens cost more.	In: $2.00 Cached: $0.200 Out: $12.00	$0.00430	$42.96 $1.43 / day
Claude Opus 5.5 AnthropicFlagship≈ token estimate	In: $4.00 Cached: $0.400 Out: $20.00	$0.00719	$71.93 $2.40 / day
GPT-6 Astra OpenAIFlagship Long-context prompts cost more.	In: $10.00 Cached: $1.000 Out: $50.00	$0.02	$179.82 $5.99 / day

Standard list prices as of 8 October 2026. Providers change prices often; check the official pages before budgeting: OpenAI · Anthropic · DeepSeek · Google.

Caching: OpenAI: cached input billed at about 10% (cache writes cost extra, not included). Anthropic: cache reads billed at 10% (cache writes cost 25% more, not included). DeepSeek: automatic context caching; cache hits cost a small fraction of the input price. Google: context caching billed at 10% (hourly storage fee not included).

AI Prompt Optimizer

The AI rewrites your prompt to be shorter and suggests a model. Savings are measured by tokenizing both versions. Your prompt is sent to our AI provider.

What is this prompt for? (optional)

About AI LLM Token & Cost Estimator

Count tokens with OpenAI's real o200k tokenizer and compare monthly API costs across current DeepSeek, OpenAI, Anthropic and Google models, with dated list prices. Enter any request volume, simulate prompt caching and Batch API discounts, and use an AI prompt optimizer whose savings are measured by re-tokenizing the result.

Why Choose Our AI Token & Cost Estimator

Feature	Smart Toolverse	Others
Live Model Benchmarks	Current DeepSeek V4, GPT-6, Claude 5.5/4.5 and Gemini 3.x list prices, dated with sources	Outdated 2023 pricing (GPT-3.5/GPT-4 only)
Prompt Caching & Volume	Per-provider cached-input pricing, Batch API discount and any monthly volume	Static per-call calculator without volume tiers
AI Prompt Compression	AI rewrites your prompt; savings are measured with the tokenizer, not guessed	No prompt optimization suggestions
Data Privacy	Token counting runs in your browser; your prompt is sent to our AI provider only when you click the optimizer	Transmits prompts to remote analytics servers

Common Uses & Applications

Budgeting enterprise LLM application cloud costs, comparing DeepSeek-V3 vs GPT-4o-mini unit economics, simulating prompt caching savings, forecasting monthly SaaS inference expenses, and compressing system prompts to reduce API bills.

Frequently Asked Questions

The calculator counts tokens with OpenAI's o200k_base BPE tokenizer in your browser. Claude, Gemini and DeepSeek use their own tokenizers, so for those models the count is a close estimate. In standard English prose, 1,000 words typically translate into approximately 1,333 tokens (roughly 4 characters per token).