# Claude Sonnet 5 at $2 and $10, Fable 5 returns, Nano Banana 2 Lite

> Anthropic's Sonnet 5 becomes the default for Free and Pro, access to Fable 5 and Mythos 5 is restored, and Google adds Gemini Omni Flash.

Published 13 Oct 2026. Coverage: 29 Jun 2026 to 5 Jul 2026. By Ali Asif.

## Items

1. **Introducing Claude Sonnet 5** (Anthropic, Frontier): Released June 30 as the default for Free and Pro at introductory pricing of $2 and $10 per million tokens. [Primary source](https://www.anthropic.com/news/claude-sonnet-5)
2. **Redeploying Claude Fable 5** (Anthropic, Frontier): Anthropic's release notes show access to Claude Fable 5 and Claude Mythos 5 restored on July 1. [Primary source](https://www.anthropic.com/news/redeploying-fable-5)
3. **Gemini Omni Flash and Nano Banana 2 Lite** (Google DeepMind, Image, video, world): June 30 brought a video generation and editing model at $0.10 per second and a fast image model at $0.034 per 1K image, both with SynthID. [Primary source](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-omni-flash-nano-banana-2-lite/)
4. **Managed Agents updates, June 30** (Anthropic, Agents and coding): Event streams gained text deltas, sessions can override the agent config, and webhooks now cover agent and deployment lifecycle events. [Primary source](https://platform.claude.com/docs/en/release-notes/overview)
5. **Leanstral 1.5: Proof Abundance for All** (Mistral AI, Science): An open 119B model (6B active) under Apache 2.0 for Lean 4 proofs, reporting 587 of 672 PutnamBench problems solved. [Primary source](https://mistral.ai/news/leanstral-1-5/)
6. **Orca: The World is in Your Mind** (arXiv, Image, video, world): A world-modeling paper that topped the Hugging Face weekly list. [Primary source](https://arxiv.org/abs/2606.30534)
7. **Scaling the Horizon, Not the Parameters: Reaching Trillion-Parameter Performance with a 35B Agent** (arXiv, Agents and coding): A claim that a 35B agent can reach trillion-parameter performance by scaling task horizon. [Primary source](https://arxiv.org/abs/2606.30616)
8. **Program-as-Weights: A Programming Paradigm for Fuzzy Functions** (arXiv, Science): A proposal for writing fuzzy functions as learned weights. [Primary source](https://arxiv.org/abs/2607.02512)

The week turned on one model launch on June 30 and one reversal the next morning.

## Sonnet 5

Anthropic released Claude Sonnet 5 on June 30. It is the default model for Free and Pro and is also available on Max, Team and Enterprise, with the API ID claude-sonnet-5. Introductory pricing is $2 per million input tokens and $10 per million output, against $5 and $25 for Opus 4.8. The updated tokenizer can produce roughly 1.0 to 1.35 times more tokens for the same input. Cyber safeguards are on by default, and Anthropic reports that Sonnet 5 never produced a full working Firefox exploit in its testing, though partial successes ran slightly above Sonnet 4.6.

The post leans on charts for BrowseComp and OSWorld-Verified across effort levels instead of quoting numbers in text, so I can say less about raw capability than I would like.

## Fable 5 comes back

Anthropic's release notes record access to Claude Fable 5 and Claude Mythos 5 restored on July 1, after the pause the launch page described on June 12.

## Google's video and image pair

On June 30 Google released Gemini Omni Flash in public preview, a model for video generation and conversational editing that takes text, image and video, at $0.10 per second of output and capped at 10-second clips for now. Nano Banana 2 Lite, its fastest and cheapest image model, costs $0.034 per 1K image and produces text-to-image in about four seconds. Both carry SynthID watermarking.

## Smaller items

Managed Agents picked up text deltas in event streams, per-session overrides of agent configuration, and webhooks for agent and deployment lifecycle events. Mistral released Leanstral 1.5 on July 2, an open 119B mixture-of-experts model (6B active) under Apache 2.0 for proof engineering in Lean 4. It reports 100% on miniF2F and 587 of 672 PutnamBench problems at its stated token budget. On the research side, Orca led the weekly papers list, and one paper argues a 35B agent can match trillion-parameter systems by scaling the horizon instead of the weights. That is a claim, not a result I have seen reproduced.

What I'd watch next: OpenAI's last flagship was GPT-5.5 in April, so any move there would reset the price picture.

## My take

Sonnet 5 at $2 and $10 is the model that fills most of my agent calls, so the price matters more to me than the headline Fable result. Anthropic notes the new tokenizer can use up to 35% more tokens for the same text, so I will measure cost per finished supplier sheet instead of cost per token.

## Sources

- https://www.anthropic.com/news/claude-sonnet-5
- https://www.anthropic.com/news/redeploying-fable-5
- https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-omni-flash-nano-banana-2-lite/
- https://platform.claude.com/docs/en/release-notes/overview
- https://mistral.ai/news/leanstral-1-5/
- https://arxiv.org/abs/2606.30534
- https://arxiv.org/abs/2606.30616
- https://arxiv.org/abs/2607.02512

Canonical: https://heyaliasif.com/ai/2026-06-29-week-in-ai