Best Corporate Cards for AI and API Spend in 2026, and Where Business AI Spend Went in July (Slash Data)
Anthropic and OpenAI took 97.83% of identified AI-platform spend on Slash business cards in July 2026, according to Slash's July AI spend data. Many of those bills are prepaid API credits that reload automatically against a card on file. The right card puts each vendor on its own limit and pays a cashback rate you can look up before applying.
Slash, a business banking platform, issues the Slash Visa® Platinum Card¹, and both of its plans include unlimited virtual cards, with up to 2% cashback on Pro. This guide covers what the July data shows, how OpenAI and Anthropic bill a card, and how Slash compares with Dash.fi, Ramp, Brex, Mercury IO and Rho for this spend.
Key Takeaways
- Anthropic's share of identified AI-platform spend on Slash cards rose from 47.59% in June to 67.86% in July, while OpenAI's fell from 49.92% to 29.97%.
- OpenAI and Anthropic both bill API use through prepaid credits with optional auto-reload, and API calls stop when the credits run out, so a declined top-up can take a product feature offline.
- Slash issues unlimited virtual cards on both plans and pays up to 1.5% cashback on Free and up to 2% on Pro, which costs $25 a month.
- Separate cards for AI inside the product and AI used by the team let each transaction post straight to cost of goods sold or operating expenses.
- Dash.fi advertises up to 3% back on AI spend, and its rewards page says that cash lands in a Personal Wallet instead of a company account.
Where Business AI Spend Went in July 2026
The July edition of Slash's monthly report covers July 1 to 30, 2026, against June 1 to 30. It uses anonymized Slash card transaction data and identifies AI merchants with a classifier that reads the merchant descriptor, the name on the card statement. The results are percentage shares and an indexed trend, with no dollar totals, transaction counts or customer counts. They show how spend divided up, not how large it was.
The two largest providers held 97.83% of identified AI-platform spend in July, against 97.51% in June. Anthropic, counted together with Claude, rose from 47.59% to 67.86%, and OpenAI, counted with ChatGPT, fell from 49.92% to 29.97%. Every other AI platform combined came to just over 2%.
Slash also tracks a normalized AI-spend index, set so that the average from December through April equals 100. It reached 990 in July, up from 474 in June and above May's previous high of 782.
Among software companies and startups with meaningful monthly spend on OpenAI or Anthropic, 53.8% used Anthropic only in July and 30.8% used OpenAI only. The 15.4% that used both was down from 26.8% in June. Slash counts usage as meaningful at $100 or more a month, or three or more transactions, on a provider.
That concentration means a handful of vendor cards covers nearly all of the identified spend. Both the shares and the index moved sharply within a single month, so a limit sized from last quarter's bill can fall short within weeks.
What Makes a Corporate Card Good for AI and API Spend?
API billing works differently from a software subscription. OpenAI's prepaid billing starts at a $5 credit purchase and turns auto-reload on by default during setup. You set a balance threshold, a restore amount and an optional monthly reload limit. Anthropic's Console sells prepaid credits the same way, and its auto-reload buys more once the balance drops below a threshold you set. Purchased credits at both providers expire a year after purchase and are non-refundable.
Each provider also caps monthly spend by usage tier. OpenAI's tiers run from $100 a month at Tier 1 to $200,000 at Tier 5. Anthropic's Start, Build and Scale tiers cap monthly spend at $500, $1,000 and $200,000.
So the card sees a stream of top-ups, and if one is declined, API calls stop as soon as the remaining credits run out. Six features decide whether a card keeps those top-ups flowing and inside a limit.
- One card per vendor. A separate virtual card for OpenAI, Anthropic and each coding tool, so a leaked key or a runaway job reaches one limit.
- A limit above the reload ceiling. The card limit set higher than the monthly reload limit configured at the provider, so the provider's own cap stops spend before the card does.
- Merchant rules on each card. Category or merchant code restrictions, so an AI card pays AI vendors and nothing else.
- Spend by merchant as it posts. A dashboard filter by merchant and card group, so a jump shows up in days.
- Cards that map to ledger lines. Product AI and internal AI on different cards, coded to different accounts.
- A published rate on the bill. Cashback stated on the issuer's own pages, with the plan price that unlocks it.
James Cruikshank, Marketing & Communications Manager at Slash, makes the case for controls in a SlashGuides video on cashback. "If you're issuing cards to your employees, you want controls. Spend limits, category restrictions, merchant blocking, virtual cards for your subscriptions. A cashback card without controls means you're trading expense oversight for rewards, which isn't a great trade-off."
1. Slash: Unlimited Vendor Cards and Up to 2% Back on AI Bills
On either plan, Slash puts each AI vendor, team or project on its own virtual card, and that spend earns cashback like any other eligible purchase, as its cashback help article explains. Its guide to classifying AI token spend covers when token costs belong in cost of goods sold and when they are operating expenses.
What Slash Does for AI and API Spend
- A card per AI vendor. You can create as many virtual cards as you need, as Slash's help center on creating virtual cards explains, and each card can draw from a chosen virtual account.
- Limits by transaction and period. A minimum or maximum per transaction, plus daily, weekly, monthly, yearly or one-time totals, set card by card.
- Merchant rules. Each card can allow or block merchant categories and merchant category codes.
- One budget across several cards. Card groups put a single budget over a set of cards, so OpenAI, Anthropic and coding-tool cards can share one engineering AI budget.
- Spend by merchant.Slash Analytics filters spend by card group, merchant, contact or payment method.
- Ledger sync.Accounting integrations with QuickBooks Online, Xero, Sage Intacct and NetSuite send coded card transactions to the ledger.
Sobhan Nejad, Co-Founder and COO of Bland AI, a conversational AI company that uses Slash, put it this way. "We've definitely run into places in the past where not having tight visibility and controls on cards has led to insane spending. Being able to set clear limits and have observability into spend prevents that type of situation."
What It Costs
Both plans are published on the pricing page. Free costs $0 a month, and Pro costs $25 a month with $0 same-day ACH, domestic wires and outgoing FedNow and RTP. The cashback help article puts the card at up to 1.5% on Free and up to 2% on Pro.
Cashback on either plan has no cap and does not expire. It pays out monthly, and you can redeem it anytime.
The standard in finance
Slash goes above with better controls, better rewards, and better support for your business.
2. Dash.fi: A Credit Limit Sized From Connected Shopify, Amazon or PayPal Data
Dash.fi sets its top rate on three kinds of spend. Its rewards page advertises up to 3% back on ad spend, shipping and AI spend, and up to 2% on other eligible card spend. It also runs an AI Spend Audit that connects to Anthropic and OpenAI through an admin API key and flags inefficient usage, model-selection issues, stale keys and billing discrepancies you can dispute.
Dash.fi sizes the overall limit from connected Shopify, Amazon or PayPal data. Each card then takes its own limit by day, month or total, with category and geography restrictions. The rewards page also says the cash back lands in a Personal Wallet, not a company account, so check that against your expense policy.
3. Ramp: $25,000 in a Linked US Bank Account Before You Apply
Ramp's virtual cards can be locked to a single vendor or merchant category, capped by transaction, day or month, set to expire, or issued as single-use cards that close after one payment.
Ramp's Free plan costs $0 per user a month, and its qualification page asks for a US corporation, LLC or LP with at least $25,000 in a linked US business bank account. The rate on the AI bill is harder to plan around, because Ramp's rewards terms say points accrue at a rate Ramp determines. NerdWallet's review reports that Ramp put the range at 0% to 1.5% in June 2026.
4. Brex: Equity Funding, Over $500,000 in Annual Revenue or a Referral to Apply
Brex pays points at different rates by category, and software is one of the higher ones. Its multiplier table gives 2x on recurring software for customers on monthly payments, and 3x for software companies on daily payments, with 1x on everything else. Points count only on dollar spend with US-based merchants. Brex vendor cards are locked to one vendor and can recur or expire.
Redeemed as cash, a point is worth 0.6 cents, so 2x returns 1.2% and 1x returns 0.6%. Booked through Brex travel, a point is worth 1 cent, so the same 2x returns 2%. The table does not list OpenAI or Anthropic by name, so whether an API top-up earns the software multiplier depends on how Brex categorizes the merchant. To apply, Brex asks for an equity investment of any amount, more than $500,000 a year in revenue, or a referral.
5. Mercury IO: Available Only to Mercury Account Holders
Mercury IO pays 1.5% cashback on all spend, deposited automatically into the Mercury account with no points to redeem. Cards can be locked to specific merchants from a list of more than 1,000, with daily, weekly or monthly limits, which is enough for a per-vendor AI card.
IO is available only to Mercury account holders. Its limit is based on balances held with Mercury, and linking external accounts raises it. Because the 1.5% applies to all spend, an API top-up earns it however the merchant is coded.
6. Rho: Up to 2% Only With Payroll, Revenue and Most Assets at Rho
Rho saves its best cashback for companies that move most of their banking there. Its corporate card page lists up to 2% cashback on Rho Platinum with Daily Terms and 1.25% standard, on up to $1,000,000 of eligible spend a calendar year. Platinum requires routing payroll and revenue through Rho, holding the majority of company assets there, and having an open Rho card.
Rho charges no annual, subscription or per-card fee and needs no personal guarantee or personal credit check to apply. It issues physical, virtual and vendor cards with spend limits set before the first purchase. A company that keeps its operating cash at another bank should plan on up to 1.25% on Daily Terms or up to 1% on Monthly Terms.
Side-by-Side Comparison
Provider figures reflect publicly published information as of September 2026 and are subject to change.
How to Choose a Card for OpenAI, Anthropic and Other AI Bills
- Price the rate at your real volume. At $20,000 a month in API spend, Slash Pro's up to 2% returns up to $400 a month and Dash.fi's up to 3% returns up to $600. Mercury IO's 1.5% returns $300, and Brex's 2x on recurring software taken as cash returns $240. The extra half point on Pro covers its $25 fee once card spend passes $5,000 a month.
- Set the provider's cap first. Put a monthly reload limit on each OpenAI and Anthropic account and set the card limit above it. A Slash Card's effective limit is the lower of a risk-based maximum and funds on deposit. Slash updates it in real time, so keep enough in the account to cover those reloads.
- Split product AI from team AI. One card for API calls that serve customers and another for the team's chat and coding seats, so each posts to its own ledger account.
- Check the exclusions list. Slash's cashback article names merchants that earn no cashback, Amazon and Microsoft among them, so a model billed through Amazon's or Microsoft's cloud marketplace may earn nothing.
Conclusion
On Slash cards, most AI spend runs through two providers that bill by prepaid, auto-reloading credits. The July data shows the split between them can move about 20 points in a month. The right card for that spend gives each vendor its own limit and merchant rules, shows the spend by merchant, and pays a rate you can find before you apply.
Slash covers each of those on a published plan, with unlimited virtual cards on Free and Pro and up to 2% back on Pro.
Talk to the Slash team about setting up vendor cards for your OpenAI and Anthropic bills.
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FAQs
1. Which corporate card is best for OpenAI and Anthropic API spend?
The best fit issues one virtual card per provider, each with its own limit and merchant rules. Slash does this on both plans, with up to 1.5% cashback on Free and up to 2% on Pro.
2. How many virtual cards can I create on Slash?
As many as you need, on either plan. Slash's help center sets no limit on the number of virtual cards, and each one takes its own transaction, daily, weekly, monthly, yearly or one-time limit.
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3. Does the Slash Card pay cashback on AI subscriptions and API credits?
Yes, charges from AI vendors earn cashback like other eligible purchases, up to 1.5% on Free and up to 2% on Pro, with no cap. Slash's cashback article lists the merchants that earn nothing, including Amazon and Microsoft, so check how a cloud-marketplace AI bill is charged.
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4. How should I code AI spend that runs through Slash?
Put AI that serves customers and AI your team uses on separate cards, then code each card to its own account. Slash syncs coded transactions to QuickBooks Online, Xero, Sage Intacct and NetSuite, and its guide to classifying AI token spend covers the cost of goods sold and operating expense split.
How to Classify AI Token Spending in Accounting
5. What does Slash's AI spend data measure?
It measures shares of identified AI-platform spend on Slash business cards, from anonymized transaction data, plus an index against the December to April average. It publishes no dollar totals, transaction counts or customer counts, and in July Anthropic held 67.86% and OpenAI 29.97%.
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