SOLANA·HUB
DE
Infrastructure

Agave 4.2: 90 Percent Less Rent, Larger Transactions, Path to 200ms Slots

The Agave 4.2 overview is out: rent drops by 90 percent, transactions grow to 4096 bytes, and slot time is set to halve to 200ms in stages. Alpenglow code is feature-complete — activation comes with 4.3.

SOLANA·HUB Editorial
Source: Solana Upgrade Page

What Happened

Solana published the official release overview for Agave 4.2 — the next version of the validator client developed by Anza. The timeline per the upgrade page: devnet release in July, recommended mainnet adoption in August, feature activations starting the week of August 17, 2026. The release bundles three major changes and lays the code foundation for the new Alpenglow consensus.

The Three Core Changes

1. Rent drops by 90 percent (SIMD-0437). The price per stored byte falls from 6,960 to 696 lamports — on-chain storage costs a tenth of what it did. For an SPL token account, the rent deposit drops from about $0.159 to $0.0159, per the upgrade page. The rollout runs across five independent feature gates so it can be monitored step by step.

2. Larger transactions (SIMD-0296). The maximum transaction size increases from 1232 to 4096 bytes — via a new, opt-in transaction format v1; existing legacy and v0 transactions remain unchanged. That creates room for applications that didn’t fit into one transaction before: ZK proofs, larger multisigs, BLS signatures. The same change had already been discussed as a prerequisite for post-quantum signatures — background in Anza’s quantum resistance roadmap.

3. Halved slot time (SIMD-0525). Slot time is set to fall from 400 to 200 milliseconds — in four stages of 50 milliseconds each, every one protected by its own feature gate. If block skip rates spike, progression stops. The result per the upgrade page: confirmations twice as fast and shorter leader windows. We covered the proposal at draft stage: SIMD-0525: Reducing Slot Times.

Alpenglow: Code Done, Activation Later

The code of the new Alpenglow consensus mechanism is feature-complete in 4.2 — but not activated on mainnet, per the overview. Activation is planned for Agave 4.3, targeted for October 2026. Alpenglow replaces TowerBFT with the Votor algorithm, targeting finality of around 150 milliseconds; vote transactions are eliminated. The basics are explained in Alpenglow: Solana’s New Consensus.

What Operators Need to Know

Per the upgrade page, 4.2 brings no breaking changes; the update is recommended but not mandatory for 4.2. The actual behavior changes arrive with the feature activations from mid-August — validators should be on the new version by then. The release follows the recent capacity increase through 100 million CU blocks.

Update (August 29, 2026): The Schedule for the Next Six Weeks

The activations are underway — and the Foundation has firmed up the calendar. Jacob Creech, VP of Technology at the Solana Foundation, names the sequence: first rent reduction step in the coming week, transaction format v1 (4096 bytes) on September 9, then the next slot time stage, and Alpenglow targeting October. These are announced targets, not guaranteed dates.

On rent, the opening move is already measurable: the first of five stages runs on testnet — lamports_per_byte drops there from 6,960 to 6,333 (roughly 9 percent); the ladder’s end goal remains 696, the 90 percent cut. Slot time, after 350ms on mainnet, stands before its next stage.

Update (September 21, 2026): Rent Stages 1 and 2 Live, v1 Format Live — and a Pause Until November

The August 29 schedule is largely done, with one shift:

  • Rent: Per the Foundation’s upgrade page, stage 1 (6,333 lamports per byte) has been active on mainnet since September 3 (epoch 1028). Stage 2 (5,080) followed on September 11 at epoch 1033, as confirmed by Anza. Cumulatively, rent now sits roughly 27 percent below the original 6,960. Stages 3 through 5 (down to 696) are expected only with Agave 4.4 in November, per the Foundation; chain state growth is to be observed between stages.
  • Transaction format v1: Instead of the targeted September 9, the gate went live on September 15 at epoch 1035, per the Foundation’s upgrade page. Transactions can now be up to 4,096 bytes (previously 1,232). Existing v0 and legacy transactions keep working; wallets and apps that don’t need the larger format are unaffected.
  • Slot time: Since September 18, mainnet runs on 250ms slots.
  • Agave 4.3: On September 21, Anza’s Brennan Watt declared v4.3.0 a go for mainnet and called on all operators to upgrade. It carries the Alpenglow code in an inactive state; activation starts on testnet.

Update (September 22, 2026): Anza Publishes the Agave 4.4 Schedule

Anza has cut the release branch for Agave v4.4 and published a schedule. The key dates per Anza’s release plan:

  • Testnet: v4.4 recommended from September 28, feature activations from October 5
  • Devnet: upgrade on October 5, feature activations from October 7
  • Mainnet-beta: volunteers with 10 percent of stake from October 19, 25 percent from October 26, recommended for all operators on November 2, start of v4.4 feature activations on November 9

According to Anza, the schedule is tentative and all dates are subject to change; operators are to wait for Discord announcements before upgrading. The plan does not name which feature gates will activate from November 9. Per the Foundation, rent stages 3 through 5 are part of Agave 4.4 (see above).

Note: This is reporting, not investment advice.

What to Watch

  • Whether November 9 holds as the start of v4.4 activations and which gates follow
  • How 250ms slots affect skip rates and when 200ms follows
  • How long the Alpenglow observation phase on testnet and devnet lasts

Sources

#agave #anza #rent #slot-zeit #alpenglow

Related Articles