Claude Opus 4.8 vs Gemini 3.1

Anthropic's flagship against Google's multimodal flagship (ultra · pro tiers) — published pricing, context windows and specs, side by side.

Compiled by AI Model Hub · Last updated 8 July 2026 · All figures from the two models' AI Model Hub pages (vendor release materials and independent trackers)

At a glance: Claude Opus 4.8 lists at $5 / $25 per 1M tokens with a 1,000,000 tokens context window; Gemini 3.1 lists at ~$2 / $12 per 1M tokens (3.1 Pro) with 2,000,000 tokens of context. The full spec table, price table and each model's published benchmarks are below.

On this page

Side-by-side specs
Price comparison
What the table says
FAQ

Claude Opus 4.8 vs Gemini 3.1: side-by-side

	Claude Opus 4.8	Gemini 3.1
Maker	Anthropic	Google
Released	27 May 2026	April 2026
Tier	Flagship	Multimodal flagship (Ultra · Pro tiers)
Context window	1,000,000 tokens	2,000,000 tokens — largest publicly available
Max output	Up to 128,000 tokens	Not specified
API price (per 1M)	$5 / $25 per 1M tokens	~$2 / $12 per 1M tokens (3.1 Pro)
Access	Proprietary — Claude API & claude.ai	Proprietary — Gemini API (Google) · consumer plan $19.99/month
Best at	Long-horizon agentic work, coding, knowledge work	Multimodal understanding, very long documents, media analysis
Standout	Current Opus flagship — same $5/$25 rate card as Opus 4.7, adaptive thinking, controllable effort levels	Native video, audio and text in one pass + sandboxed Python execution

Price comparison

Model	Input (per 1M)	Output (per 1M)
Claude Opus 4.8	$5.00	$25.00
Claude Opus 4.8 (fast mode)	$10.00	$50.00
Gemini 3.1 Pro (approx.)	~$2.00	~$12.00

Estimate your monthly API cost for Claude Opus 4.8 vs Gemini 3.1 with the LLM API pricing calculator →

What the table says

Pricing. Claude Opus 4.8 lists at $5 / $25 per 1M tokens; Gemini 3.1 lists at ~$2 / $12 per 1M tokens (3.1 Pro). On these published rates, Gemini 3.1's input price is roughly 2.5x lower than Claude Opus 4.8's, and Gemini 3.1's output price is roughly 2.1x lower than Claude Opus 4.8's. Claude Opus 4.8 also offers a fast mode at $10 / $50 per 1M tokens with up to 2.5x output speed.
Context. Gemini 3.1's context window (2,000,000 tokens — largest publicly available) is about 2x the size of Claude Opus 4.8's (1,000,000 tokens).
Access. Both are proprietary, hosted-API models; neither publishes weights for self-hosting.

Key takeaway

Everything above is drawn from the two models' published rate cards and spec sheets. Which one fits depends on the workload you price it against — run your own token volumes through the pricing calculator to see the monthly difference.

Full Claude Opus 4.8 overview Full Gemini 3.1 overview

Frequently asked questions

Which is cheaper, Claude Opus 4.8 or Gemini 3.1?

Gemini 3.1 — it lists at ~$2 / $12 per 1M tokens (3.1 Pro) versus $5 / $25 per 1M tokens for Claude Opus 4.8 (Gemini 3.1 Pro pricing is approximate).

Which has the bigger context window, Claude Opus 4.8 or Gemini 3.1?

Gemini 3.1 — 2,000,000 tokens — largest publicly available, versus 1,000,000 tokens for Claude Opus 4.8.

Which model is newer?

Claude Opus 4.8 is the more recent release (27 May 2026); Gemini 3.1 was released April 2026.

Can I run Claude Opus 4.8 or Gemini 3.1 locally?

No — both Claude Opus 4.8 and Gemini 3.1 are proprietary models accessed through their vendors' APIs and apps; neither publishes weights.

Related comparisons

Sources & further reading: