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OpenAI · gpt-5.1

Provider prices, cheapest first

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Price comparison

Official (cash)
Input 1.25 / output 10 USD/million tokensOpenAI ·
Lowest inference provider (cash)
Input 1.25 / output 10 USD/million tokensOpenRouter · Aggregator ·
Lowest relay (credit)
12.031 USD credit/million total tokenskelaiapi.cc "vip_2_official" ·

Official and inference-provider prices are cash; relay prices are site credit (USD credit or CNY credit), a different unit, compared separately. Relay prices are per million total tokens at 75% input and 25% output.

All official and inference price observations

OpenAI · gpt-5.1 official price: input 1.25, output 10 USD per million tokens (OpenAI, observed 2026-10-24). Cheapest inference provider: OpenRouter, input 1.25, output 10 USD per million tokens. Cheapest relay: kelaiapi.cc, group "vip_2_official" 12.031 USD_CREDIT per million total tokens (credit price, not cash, observed 2026-10-23). 101 sites have comparable prices; 177 sites list this model.Relay blended price uses 75% input and 25% output. Conditions: Standard processing · documentSection: Flagship models · processingMode: standard · Additional web_search price 0.01 USD (per unit as declared by OpenRouter)

Price ranges per million tokens

Official cash prices · Lowest 3.4375 · median 3.4375 · highest 3.4375 · 1 quotes USD / per million tokens

Inference provider cash prices · Lowest 3.4375 · median 3.4375 · highest 3.4375 · 1 quotes USD / per million tokens

Relay USD credit prices · Lowest 12.031 · median 12.031 · highest 12.031 · 1 quotes USD / per million tokens, site credit

Official price

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and source
OpenAIStandard1.25100.125—USD / 1M tokensStandard processing · documentSection: Flagship models · processingMode: standard
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [],
  "contextTier": null,
  "processingMode": "standard",
  "conditionNotes": [
    "documentSection: Flagship models",
    "processingMode: standard"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source

Official prices are the vendor's cash prices. Inference providers also list cash prices and can be compared directly. Relays list prices in site credit; what you actually pay depends on each site's top-up rate, so they cannot be compared with official prices directly.

Inference providers

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and sourcevs official
OpenRouter · AggregatorStandard1.25100.125—USD / 1M tokensAdditional web_search price 0.01 USD (per unit as declared by OpenRouter)
Full price conditions
{
  "sourceUnit": "USD_PER_TOKEN",
  "sourceAmounts": {
    "cacheRead": "0.000000125",
    "input": "0.00000125",
    "output": "0.00001"
  },
  "conditions": [],
  "contextTier": null,
  "processingMode": null,
  "conditionNotes": [
    "Additional web_search price 0.01 USD (per unit as declared by OpenRouter)"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
Other tariffs and prices to review

Official price

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and source
OpenAIBatch0.62550.0625—USD / 1M tokensBatch processing · processingMode: batch · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: batch"
  ],
  "contextTier": null,
  "processingMode": "batch",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenAIOther tariff0.62550.0625—USD / 1M tokensFlex processing · processingMode: flex · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: flex"
  ],
  "contextTier": null,
  "processingMode": "flex",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenAIOther tariff2.5200.25—USD / 1M tokensFast processing · processingMode: fast · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: fast"
  ],
  "contextTier": null,
  "processingMode": "fast",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source

Inference providers

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and source
OpenRouter · AggregatorBatch0.62550.0625—USD / 1M tokensOpenRouter batch variant · Additional web_search price 0.01 USD (per unit as declared by OpenRouter)
Full price conditions
{
  "sourceUnit": "USD_PER_TOKEN",
  "sourceAmounts": {
    "cacheRead": "0.0000000625",
    "input": "0.000000625",
    "output": "0.000005"
  },
  "conditions": [
    "OpenRouter batch variant"
  ],
  "contextTier": null,
  "processingMode": null,
  "conditionNotes": [
    "Additional web_search price 0.01 USD (per unit as declared by OpenRouter)"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
Older official and inference provider prices

Earlier price observations and their original conditions

Official price

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and source
OpenAIBatch0.62550.0625—USD / 1M tokensBatch processing · processingMode: batch · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: batch"
  ],
  "contextTier": null,
  "processingMode": "batch",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenAIOther tariff0.62550.0625—USD / 1M tokensFlex processing · processingMode: flex · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: flex"
  ],
  "contextTier": null,
  "processingMode": "flex",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenAIStandard1.25100.125—USD / 1M tokensStandard processing · documentSection: Flagship models · processingMode: standard
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [],
  "contextTier": null,
  "processingMode": "standard",
  "conditionNotes": [
    "documentSection: Flagship models",
    "processingMode: standard"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenAIOther tariff2.5200.25—USD / 1M tokensFast processing · processingMode: fast · documentSection: Flagship models
Full price conditions
{
  "sourceUnit": null,
  "sourceAmounts": null,
  "conditions": [
    "processingMode: fast"
  ],
  "contextTier": null,
  "processingMode": "fast",
  "conditionNotes": [
    "documentSection: Flagship models"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source

Inference providers

ProviderTariffInputOutputCache readCache writeUnitObservedConditions and source
OpenRouter · AggregatorBatch0.62550.0625—USD / 1M tokensOpenRouter batch variant · Additional web_search price 0.01 USD (per unit as declared by OpenRouter)
Full price conditions
{
  "sourceUnit": "USD_PER_TOKEN",
  "sourceAmounts": {
    "cacheRead": "0.0000000625",
    "input": "0.000000625",
    "output": "0.000005"
  },
  "conditions": [
    "OpenRouter batch variant"
  ],
  "contextTier": null,
  "processingMode": null,
  "conditionNotes": [
    "Additional web_search price 0.01 USD (per unit as declared by OpenRouter)"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source
OpenRouter · AggregatorStandard1.25100.125—USD / 1M tokensAdditional web_search price 0.01 USD (per unit as declared by OpenRouter)
Full price conditions
{
  "sourceUnit": "USD_PER_TOKEN",
  "sourceAmounts": {
    "cacheRead": "0.000000125",
    "input": "0.00000125",
    "output": "0.00001"
  },
  "conditions": [],
  "contextTier": null,
  "processingMode": null,
  "conditionNotes": [
    "Additional web_search price 0.01 USD (per unit as declared by OpenRouter)"
  ],
  "effectiveFrom": null,
  "effectiveUntil": null
}

Official source

Unit: USD credits per 1M tokens. These are site-credit prices; actual cost depends on each site’s top-up rate.

Filtering by provider: kelaiapi.cc

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Blended price = input × 75% + output × 25%, without cache.

Price range: lowest 12.031 · median 12.031 · highest 12.031 (1 quotes, USD credits per million total tokens)

sites have comparable prices101177 sites list this model; approximately 1 operators
Lowest input price4.375USD credits / 1M
Median of each provider’s lowest price4.375USD credits / 1M

Relays

Prices below are in site credit, not cash.

#ProviderPlan / conditionsInput ↑USD credits / 1MOutput USD credits / 1MCache readUSD credits / 1MBlendedUSD credits / 1MDetails
Recent price
01kelaiapi.ccAsk or discussCollected:
Collected this cycle
View 1 plans		vip_2_official
oai official relay [machine translation]Original: oai官转
Operator pending verification		4.37535—12.031Median price ÷ this price: 1×Full prices and sources
Special groups · 1 rows · not ranked

These plans are marked as test, internal, disabled, gated by top-up or membership, or have a near-zero ratio. They may not be purchasable or stable, so they are listed separately and left out of the ranking and statistics.

  • test or debug group: 1 rows
View all 1 rows →
Related variants · 16 rows · not ranked

These are special editions of the model (thinking, max, search, batch, long context, free, etc.). They are priced differently from the base model, so they are listed separately and not ranked. Names that only add an effort level such as low, high or nothinking are compared with the base model.

  • gpt-5.1-thinking (-thinking · thinking edition): 16 rows
  • api.bltcy.ai · vip · gpt-5.1-thinking · Input 1 / Output 8 USD credits / 1M
  • api.bltcy.top · vip · gpt-5.1-thinking · Input 1 / Output 8 USD credits / 1M
  • kg-api.cloud · vip · gpt-5.1-thinking · Input 1 / Output 8 USD credits / 1M
  • one-api.bltcy.top · vip · gpt-5.1-thinking · Input 1 / Output 8 USD credits / 1M
  • api.bltcy.ai · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
  • api.bltcy.top · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
  • api.hopeai.cc · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
  • api.xhuoai.com · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
  • api.xistree.hk · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
  • kg-api.cloud · default · gpt-5.1-thinking · Input 1.25 / Output 10 USD credits / 1M
View all 16 rows →
How this ranking works

All per-token prices: 93,968 prices from 854 sites (about 751 companies). 84,786 are ranked, from 838 sites (about 736 companies); 9,182 more are listed separately and not ranked. Prices collected up to 2026-10-24.

This model has 789 recorded prices; 365 can be compared directly (346 ranked, 19 listed separately). Not comparable yet: price not parsed yet 245, scope of the official doc price not confirmed 60, ratio looks unset 33, new price under review; showing the previous one 30, tiered by rules (see Tiered prices) 29, display unit not confirmed 12, billed per request or another unit 3

1 recent · 0 stale (older than 10 days, or not updated by this refresh) · 0 unverified timestamps. Minimum and median only count recent paid prices; older prices stay in the table. 0 zero-valued pairs are separately unverified, without proof of free eligibility. Timing does not verify payment, upstream identity or quality.

Prices are converted to site credits using each site’s published ratio. What you actually pay depends on its top-up rate. Input, output and cache prices in each row come from the same plan. Several sites run by the same company take one place in the ranking: its cheapest plan, with the other sites listed under it. We judge “same company” by identical prices, status pages or homepage code; this is not a legal finding. To see every site’s prices, choose “All plans” or filter by provider.

“Self-declared unofficial channel” means the plan name itself says “reverse-engineered” or similar. We have not verified their source or quality. Minimum and median only count regular plans.

Full methodology →

Sources not accepted this cycle and reasons

FAQ

Which API is cheapest for OpenAI · gpt-5.1?

kelaiapi.cc, group "vip_2_official", 12.031 USD credit per million total tokens, observed 2026-10-23. 101 sites have comparable prices.

What is the official price for OpenAI · gpt-5.1?

Input 1.25, output 10 USD per million tokens, checked 2026-10-24. Lowest inference provider: OpenRouter, input 1.25, output 10 USD per million tokens.

How do I use OpenAI · gpt-5.1 in Claude Code or Codex?

Install Grandet Skill, then say "Connect the cheapest OpenAI · gpt-5.1 API to Claude Code for me". Install Skill →