Overview (May 2026)

Two conversational assistants, two strategies

ChatGPT (OpenAI, USA) leads the consumer market and holds the lead on coding benchmarks. Le Chat (Mistral, France) bets on Cerebras speed, price, European compliance, and open weights. This comparison cites the official pricing pages and published benchmarks.

Le Chat (Mistral)

Speed, price, European sovereignty

Flash Answers at about 1,100 tokens per second on Cerebras WSE-3 (source: Cerebras blog, February 2025). Pro at $14.99/month, student tier at $6.99. French company outside US CLOUD Act jurisdiction. Several models shipped as open weights (Mistral Medium 3.5, Small 4, Codestral) under Apache 2.0.

Strong for: regulated EU workflows, on-prem or private-VPC deployment on Enterprise, French- and German-speaking teams.

Test Le Chat hereMistral pricing

ChatGPT (OpenAI)

Ecosystem, agentic coding, advanced voice

Plus at $20/month, Pro at $100 or $200 (5x / 20x Plus limits, launched April 2026). GPT-5.5 (released April 23, 2026) leads SWE-bench Verified at 88.7%. Primary hosting in the US (CLOUD Act applies). Widest catalog of custom GPTs in the Store.

Strong for: complex agentic coding, Realtime voice, GPT-Image generation, plugin ecosystem. Note: Sora was discontinued April 26, 2026; Sora 2 capabilities are folded into ChatGPT Plus and Pro.

Visit chatgpt.com

Performance

Response speed

Flash Answers at 1,100 tok/s, no OpenAI equivalent.

Mistral and Cerebras co-developed speculative decoding and reach about 1,100 tokens per second on Le Chat (Cerebras blog, February 2025). GPT-5.5 runs around 80-180 tok/s depending on reasoning mode (Artificial Analysis, llm-stats). The gap is most visible on long replies, code, and translations.

Cerebras official

Cost

Price

Le Chat Pro is 25% cheaper, students even more so.

Le Chat Pro at $14.99/mo vs ChatGPT Plus at $20. Student Pro at $6.99 (annual .edu verification), no ChatGPT consumer equivalent. API: Mistral Large 3 at $0.50 input / $1.50 output per 1M tokens. GPT-5.5 is more expensive on the API and qualitatively faster on agentic code.

Official 2026 pricing

Sovereignty

Compliance and data

Mistral is French; ChatGPT falls under US jurisdiction.

Mistral holds SOC 2 Type II; ISO 27001 in progress (October 2025). EU data residency on Enterprise, plus on-prem or private-VPC deployment. OpenAI offers regional residency (US, EU, UK, JP) on Enterprise but remains under the CLOUD Act. Important: Le Chat's consumer tiers may reuse chats for training by default. Check the toggle in privacy settings before handling sensitive data.

Official trust center

Ecosystem

Connectors and plugins

Open MCP vs closed GPT Store: two logics.

Le Chat speaks the Model Context Protocol (MCP), an open standard published by Anthropic and adopted by Mistral, Cursor, and others. 22 official connectors (GitHub, Snowflake, Databricks, Atlassian, Stripe, etc.) available even on Free. ChatGPT offers GPT Actions and a closed Store with hundreds of thousands of custom GPTs (exact count unpublished in 2026). To wire up internal systems, MCP is faster to set up.

Available Free / Pro / Team

Benchmarks

Coding and agents

GPT-5.5 leads SWE-bench Verified by a clear margin.

On SWE-bench Verified, GPT-5.5 measures at 88.7% (BenchLM, TokenMix). Mistral Medium 3.5 hits 77.6% (official Mistral announcement, May 2, 2026). Mistral Large 3 has not published an official SWE-bench score. LiveCodeBench v6: Mistral Large 3 around 82.8% (Vals AI). Cursor, Cline, and Claude Code default to Claude or GPT, not Mistral.

Public data

Availability

Open models

Mistral ships weights, OpenAI does not.

Mistral Medium 3.5 (128B, May 2026), Mistral Small 4 (119B MoE / 6B active, March 2026), Codestral, Pixtral Large, and several others are distributed under Apache 2.0. Companies can self-host them. ChatGPT and the GPT-5 family remain proprietary, accessible only through the OpenAI API.

Apache 2.0

When Le Chat wins

Four concrete cases where Le Chat is the better choice in 2026

Both tools are good. Here are the contexts where Le Chat clearly comes out ahead.

You operate under EU regulation

Hospitals, banks, public sector, legal: Mistral is French, offers EU data residency on Enterprise, and an on-prem deployment option. ChatGPT stays SaaS-only and remains under the CLOUD Act even with residency.

Fast everyday chat matters more than complex code

Flash Answers at 1,100 tok/s gives a UX that does not exist elsewhere. For brainstorming, translation, marketing copy, and rapid iteration, Le Chat feels near real-time.

You want to pay less without losing features

Pro at $14.99 gets you all Mistral models, Memories, Canvas, Deep Research, and 22 connectors. ChatGPT Plus is $20 (25% more expensive). Student Pro at $6.99, no OpenAI equivalent.

You deploy on internal infrastructure

Mistral Medium 3.5 (128B), Small 4, Codestral, Pixtral are released under Apache 2.0. You can self-host them. OpenAI offers no self-host option.

How to test in under an hour

Three prompts to run side by side

The serious approach: same prompt, same context, compare rendering, speed, quality.

Test 1: long streamed reply

  • Ask for a detailed 1,500-word summary on a topic you know well.
  • Time the seconds until the last token on both products.
  • Verify factual accuracy and structure (headings, lists, citations).
  • Flash Answers shines here.

Test 2: real coding task

  • Drop in a 200-400 line source file and ask for a refactor with specific constraints.
  • Measure: which model understands intent, which introduces regressions.
  • GPT-5.5 stays ahead on multi-file agentic tasks.
  • For short code, Mistral Codestral is competitive.

Test 3: multi-source research

  • Enable Deep Research in Le Chat (Pro / Team) and the equivalent in ChatGPT.
  • Give an open topic: market analysis, regulation, technology comparison.
  • Compare: depth, clickable citations, coverage of European sources.
  • Le Chat Deep Research covers French and German sources better.
Run a test hereOfficial Le Chat

When ChatGPT wins

Four situations where ChatGPT remains the right choice

Be honest about the areas where OpenAI keeps the technical lead as of May 2026.

Complex multi-file agentic coding

GPT-5.5 hits 88.7% on SWE-bench Verified (BenchLM). Mistral Medium 3.5 is at 77.6%. Cursor, Cline, Claude Code, and Windsurf default to GPT-5.5 or Claude, not Mistral.

Advanced voice and multimodal

Advanced Voice Mode (still GPT-4o-audio backed in late 2025) remains more natural than Voxtral on the consumer side. GPT-Image generation, Whisper transcription, native multimodal integration.

Custom GPT ecosystem and plugins

The GPT Store launched in January 2024 contains hundreds of thousands of custom GPTs. More third-party plugins, more native integrations, more tutorials, and a larger user community.

Computer Use and desktop automation

GPT-5.4 introduced a native Computer Use API (75% OSWorld). Mistral has no equivalent as of May 2026. For desktop automation flows, ChatGPT is ahead.

Caveats before you switch

Three things consumer comparisons miss

Important nuances to keep in mind.

Mistral Large 3 has not published its SWE-bench Verified score

  • The official SWE-bench score is for Mistral Medium 3.5 (77.6%, announced May 2, 2026).
  • If a site publishes a SWE-bench number for Large 3, it is unsourced.
  • To compare agentic coding, use LiveCodeBench (Large 3 ~82.8%) or run your own test.

Cerebras 10x was measured in February 2025

  • The 1,100 tok/s figure on Le Chat is reproducible and confirmed by Cerebras.
  • The 10x multiplier compares against GPT-4o, not GPT-5.5 which is faster.
  • The speed advantage is real but the exact multiplier in 2026 should be hedged.

Sora is no longer a ChatGPT differentiator

  • Sora web and app were discontinued April 26, 2026 (OpenAI Help Center).
  • Sora 2 capabilities are now folded into ChatGPT Plus / Pro.
  • The Sora API sunsets September 24, 2026.
  • Any comparison citing Sora as an independent advantage is outdated.
See GPT-5.5 (OpenAI)

FAQ

The questions that come up most

Short answers with verifiable sources.

Is Le Chat an official Mistral product?

Yes. Le Chat is built by Mistral AI, a French company based in Paris. The official product lives at chat.mistral.ai. lechatai.online (this site) is an independent unaffiliated guide.

How much does Le Chat cost versus ChatGPT in 2026?

Free is $0 with daily caps. Le Chat Pro $14.99/mo, ChatGPT Plus $20. Le Chat Team $24.99/user ($19.99 annual), ChatGPT Business $20/seat annual. Enterprise is custom for both.

Is Flash Answers really 10x faster?

The 1,100 tokens/second figure is confirmed by Cerebras (blog, February 2025). The 10x multiplier compares against GPT-4o at that time. GPT-5.5 is faster today, so the lead is real but should be hedged.

Does Le Chat use my data for training?

On consumer tiers, by default, conversations may be used to improve models. You can disable via privacy settings. Team and Enterprise disable training by default.

Which Mistral models are available in Le Chat?

Mistral Large 3 (flagship, December 2025), Mistral Medium 3.5 (May 2026, agentic coding), Mistral Small 4 (March 2026, fast), Codestral (code), Pixtral Large (multimodal), Voxtral (TTS).

Does Le Chat work on mobile?

Yes. iOS and Android apps launched February 2025, crossing one million downloads in 13 days. Memories and history sync with the web version.

Getting started

Migrate in three steps

Concrete path to evaluate without risk.

Step 1: test five real prompts here

No signup. Type five real questions tied to your work. Measure speed, relevance, output format.

Step 2: open the official Le Chat

Free account costs nothing. Memories, Canvas, Code Interpreter, and Flux Ultra image generation are all included. Generous daily caps.

Step 3: go Pro if Deep Research interests you

Pro at $14.99 unlocks Deep Research, extended Flash Answers, and priority access. Cancel anytime, no commitment.

Official sources

Verify for yourself: 8 references for this comparison

All data above comes from public sources. Direct links so you can verify or dig deeper.

Test Le Chat here

Cerebras + Mistral: Flash Answers at 1,100 tok/s

Official Cerebras announcement, February 2025, detailing speculative decoding architecture and speed figures.

Read Cerebras blog

Mistral Le Chat pricing (official)

Canonical source for Free, Pro, Team, Enterprise tier limits and the API price grid.

Mistral pricing

ChatGPT pricing (official)

Free, Go, Plus, Pro ($100 / $200), Business, Enterprise plans with detailed caps.

OpenAI pricing

GPT-5.5 launch (OpenAI, April 23, 2026)

Official announcement of the GPT-5.5 / GPT-5.5 Thinking / GPT-5.5 Pro family and agentic capabilities.

GPT-5.5 launch

Mistral Medium 3.5 SWE-bench 77.6%

Mistral announcement May 2, 2026, agentic coding workhorse, with the official SWE-bench Verified score.

Mistral news

Le Chat dives deep (Deep Research GA)

Deep Research, Projects, and Voice launch in July 2025. Official source for Deep Research's Pro-only status.

Deep Research launch

Mistral Trust Center (SOC 2 / ISO 27001)

Mistral certification status, accessible on request for legal and compliance teams.

Trust Center

Sora discontinuation (OpenAI, April 26, 2026)

Official notice ending Sora web and app, with Sora 2 capabilities folded into ChatGPT Plus and Pro.

Sora discontinuation

Decide without risk

Run the same prompt in Le Chat and ChatGPT, here

The best comparison: a real test on your own use case. No signup, no card. Five minutes is enough to see which one fits.

Test Le Chat hereVisit official Le Chat